How can i use javascript or php to check if an addon is already installed in my firefox? Thanks!

I am a coop student for designing websites using drupal, but i cannot figure out a way to solve this problem, can you pro guys help me? thanks

You can't test if an extension is installed. You can do that for plugins via navigator.plugins
A good place to ask questions and advice about web development is at the mozillaZine Web Development/Standards Evangelism forum.<br />
The helpers at that forum are more knowledgeable about web development issues.<br />
You need to register at the mozillaZine forum site in order to post at that forum.<br />
See http://forums.mozillazine.org/viewforum.php?f=25

Similar Messages

How can I use javascript in a Text Area with HTML editor??

My question is... how can I use javascript in Text Area with HTML editor??
I can use javascript functions that change the content of Text Areas but i can´t if i try in text area with html editor....
I need to limit number of characters in a text area with html editor and i can´t.
could anybody help me please?

I have been experiencing similar problems with the HTML Editor and have managed to find an answer that should start to answer some of my questions. The Apex HTML Editor Standard is actually an HTML editor called FCKeditor. The FCKeditor has a Javascript API that can be found at http://docs.fckeditor.net/FCKeditor_2.x/Developers_Guide/JavaScript_API. Unfortuately this doesn't seem to give the whole answer and I found more at http://www.houseoffusion.com/groups/cf-talk/thread.cfm/threadid:49607.
I needed to get the text entered within my html editor standard (e.g. P1_MYTEXT) and use it within my javascript function. I did this by using the following script
<script language="JavaScript" type="text/javascript">
function showtext(){
var oEditor = FCKeditorAPI.GetInstance('P1_MYTEXT');
var editortext = escape(oEditor.GetXHTML(oEditor.FormatOutput));
alert(editortext);
</script>
Hope this helps.
Matthew

How can i use javascript in weblogic jsp

Hai,
          I know that we can use the jsvascript to validate the html parameters.
          Is the wblogic jsp support the javascript ?. I tried in weblogic
          5.1.0.,the javascript is not working.
          anybody can help me how to validate html input and how can i use
          javascript in jsp.
          Thanks
          Srinivas


          Do you know how JSP can use a variable defined in Javascrip ?
          Thx,
          Lin
          "Cameron Purdy" <[email protected]> wrote:
          >Write your JSP as you would any HTML file, including JavaScript. Then
          >rename the .html file to .jsp. Add your custom tags and Java code as
          >desired. Done.
          >
          >There was a complaint in the 5.0 beta about the JSP parser choking on
          >JavaScript, so I would make sure you at least try on the latest 5.1 service
          >pack, just in case.
          >
          >Cameron Purdy
          >
          >"SRINIVAS" <[email protected]> wrote in message
          >news:[email protected]..
          >> Hai,
          >> I know that we can use the jsvascript to validate the html parameters.
          >>
          >> Is the wblogic jsp support the javascript ?. I tried in weblogic
          >> 5.1.0.,the javascript is not working.
          >> anybody can help me how to validate html input and how can i use
          >> javascript in jsp.
          >>
          >> Thanks
          >> Srinivas
          >>
          >
          >

HT5114 How can I use my gift card to purchase? It says i already redeemed it but I haven't used the money in it.

How can I use my gift card to purchase? It says i already redeemed it but I haven't used the money in it.

Does any balance show on your account ? My account's balance shows at the top left of the store's page on my computer's iTunes, and by logging in to view my account via the Store > View Account menu option. On my iOS devices it shows at the bottom of, for example, the Featured tab in the App Store app under my account id (or you can view your account via Settings > iTunes & App Store and it should show on the screen that you are taken to).
You can check your account's purchase history via your computer's iTunes : See your purchase history in the iTunes Store
If this is the first time that you've tried to download anything from the store, then unless you followed the instructions on this page when creating your account : http://support.apple.com/kb/HT2534
then credit card details will need to be entered before the account can be used to download any item from the store.
If you are getting a message to review your account then you could see if this post by mountaingoatgirl lets you do so without needing to enter credit card details : https://discussions.apple.com/message/24303054#24303054

How can i use JavaScript in Struts

Any one can please tell me how can i use simple java script in Struts framework
like
<script language="javascript">
function call()
alert("You Are In call()")
</script>
</head>
<body>
<form ..... >
<input type="button" value="CHECK" onclick="return call()" >
</form >........
ok this i can use in normal jsp
but how can i use same in Struts framework
Thanks in advance

This forum is for JSF, not Struts. Your best bet to get your question answered, is to post to the struts user mailing list.

TS1292 how can i use my i tunes gift card if i bought it here in saudi arabia? thanks

how can i use my i tunes gift card if i bought it here in saudi arabia? thanks

Try Here > http://support.apple.com/kb/TS1292
If no joy...
Contact iTunes Customer Service and request assistance
Use this Link > Apple Support iTunes Store Contact

How can I use javascript functions?

I want to put a custom image gallery on my Muse layout.
To do that I put all my .js-files-folder in the same folder like the other html-files.
Now I have to import javascript files, which you normally have to put between the <head></head> tags.
<body>
     <head>
          <script type="text/javascript" src="js/jquery-1.7.1.min.js"></script>
     </head>
</body>
That is all i want to do, so how can I put code between the <head> tags?

There isn't currently the ability to insert things into the <head> tag, but that is something we are discussing for the future. If all you need is jQuery, it is included as part of the standard Muse JavaScript files. If you need another JS file, you can include it by putting the <script> tag in arbitrary HTML - script tags are legal in the body (generated html from Muse sites has the JS includes at the end of the body tag to improve load performance). As an example, in a site I went to Object->Insert HTML. In the popup box, I added the following code
<div id="testThis" onclick="testFn(event)" style="width:280px;min-height:130px;border-width:1px;border-color:black;background-color:blue;position:relative;display:inline;float:left;"/>
<script src="scripts/1.1/foo.js" type="text/javascript"></script>
Then after exporting/publishing, I uploaded foo.js to the scripts/1.1 folder on my webserver. Clicking on this object then fired the testFn I added in foo.js.
Hope this helps.
-Sam

How can I use JavaScript extention functions with Xalan for transforming XML with XSL

While transforming standart XML and XSL files to HTML with this servlet:
package mypackage1;
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import java.util.*;
import java.net.URL;
import javax.xml.transform.*;
import javax.xml.transform.stream.StreamSource;
import javax.xml.transform.stream.StreamResult;
import org.mozilla.javascript;
public class Servlet2 extends HttpServlet
private static final String CONTENT_TYPE = "text/html; charset=windows-1252";
public void init(ServletConfig config) throws ServletException
super.init(config);
public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException
try
response.setContentType(CONTENT_TYPE);
PrintWriter out = response.getWriter();
TransformerFactory tFactory = TransformerFactory.newInstance();
Source xmlSource = new StreamSource(new FileReader("c:/aaa.xml"));
Source xslSource = new StreamSource(new FileReader("c:/bbb.xsl"));
Transformer transformer = tFactory.newTransformer(xslSource);
transformer.transform (xmlSource, new StreamResult(out));
catch (Exception e)
e.printStackTrace();
everything is going ok,
but when try to use javascript function in XSL file, for example like in this:
<?xml version="1.0"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0"
xmlns:lxslt="http://xml.apache.org/xslt" xmlns:my-ext="ext1"
extension-element-prefixes="my-ext">
<lxslt:component prefix="my-ext"
functions="getdate">
<lxslt:script lang="javascript">
function getdate() {
var d = new Date();
return d.toUTCString();
</lxslt:script>
</lxslt:component>
<xsl:template match="/">
<p><xsl:copy-of select="my-ext:getdate()"/></p>
</xsl:template>
</xsl:stylesheet>
recieve error-message:
XSL-1000: (Fatal Error) Error while parsing XSL file (Extension function namespace should start with 'http://www.oracle.com/XSL/Transform/java/'.).
What kind of namespace I should specify?

Hello, Paul.
I'm sure you may not use JavaScript as a language for creating XSLT extention functions with Oracle XDK Parser. This is since parser might have JavaScript interpreter to work with JavaScript, but it has not.
If you need to build any XSLT extention functions you must build them as Java class' static methods.
After that, you define the usage of the class by mean of namespace declaration as:
xmlns:your-ns="http://www.oracle.com/XSL/Transform/java/yourpackage.Yourclass"
(Prefix "http://www.oracle.com/XSL/Transform/java/" may differs if you use non-Oracle XML parser)
and use class' static method in XSLT:
<xsl:value-of select="your-ns.staticMethodName(paramsIfAny)"/>
In your case you may wish to use standard Date class:
xmlns:date="http://www.oracle.com/XSL/Transform/java/java.util.Date"
<xsl:value-of select="date:toString(date:new)"/>

How can I use javascript to access netui data-repeater item?

I have a 2-dim table of <netui: checkbox> using a <netui data-repeater> to interate over a contact email (column) and an event (rows).
          My problem is that I need to have a select all checkbox at the bottom of each column (per email) and be able to select all event for an email (when checked) and deselect all when the checkbox is unchecked.
          I can do it in java page flow but I can't have a page refresh.
          I want to do it on the page with javascript. The problem is that using
          document[getNetuiTagName("aform", this)][getNetuiTagName("email1", this)].checked
          with the "tagId" in each <netui> tag I can't access each iteration of the data repeater (I only get the last one).
          What I need is a reference to each repeater element. I do not know how many rows or columns I will have (based on the data).
          Is there any way to reference the obeject itself in javascript so I can loop through the items in the netui data-repeater?
          This is what is rendered in the html netui mapping:
          netui_names.con1="portlet_2_3wlw-checkbox_key:{actionForm.opts[4].cons[1].selContact}"
          I really want to be able to access this and loop through the arrays for opts (event) and cons(email)
          Here's the code:
          <netui:form action="submitEvents" tagId="eform" focus="">
          <table>
          <tr>
          <td>
          <table id="eTable" cellpadding="2" cellspacing="1" border="0">
          <tr bgcolor="#cccccc" class="BlackHeavy8">
          
          <td colspan="2">Event</td>
          <netui-data:repeater dataSource="{pageFlow.contacts}" defaultText="No contacts configured.">
          <netui-data:repeaterHeader>
          </netui-data:repeaterHeader>
          <netui-data:repeaterItem>
          <netui-data:choiceMethod object="{pageFlow}" method="getAddHeader">
          <netui-data:methodParameter value="{container.item.contact_icon}" />
          </netui-data:choiceMethod>
          <netui-data:choice value="default">
          <td nowrap="true" bgcolor="#FFCCCC"><netui:image src="{container.item.contact_icon}"/>
          <netui:label value="{container.item.contact_value}" defaultValue="Â "></netui:label>
          </td>
          </netui-data:choice>
          <netui-data:choice value="blue">
          <td nowrap="true" bgcolor="#D8EBFE"><netui:image src="{container.item.contact_icon}"/>
          <netui:label value="{container.item.contact_value}" defaultValue="Â "></netui:label>
          </td>
          </netui-data:choice>
          <netui-data:choice value="green">
          <td nowrap="true" bgcolor="#CCFFCC"><netui:image src="{container.item.contact_icon}"/>
          <netui:label value="{container.item.contact_value}" defaultValue="Â "></netui:label>
          </td>
          </netui-data:choice>
          <netui-data:choice value="yellow">
          <td nowrap="true" bgcolor="#FFFFCC"><netui:image src="{container.item.contact_icon}"/>
          <netui:label value="{container.item.contact_value}" defaultValue="Â "></netui:label>
          </td>
          </netui-data:choice>
          </netui-data:repeaterItem>
          <netui-data:repeaterFooter></netui-data:repeaterFooter>
          </netui-data:repeater>
          </tr>
          <tr>
          <td colspan="7">
          <netui-data:repeater dataSource="{actionForm.opts}">
          <netui-data:repeaterHeader>
          </netui-data:repeaterHeader>
          <netui-data:repeaterItem>
          <netui-data:choiceMethod object="{pageFlow}" method="isEvenRow">
          <netui-data:methodParameter type="int" value="{container.index}" />
          </netui-data:choiceMethod>
          <netui-data:choice value="true">
          <tr class="BlackNorm8">
          
          
          <td colspan="2">
          <netui:label value="{container.item.eventName}" />
          <netui:hidden dataSource="{container.item.eventId}" />
          </td>
          <netui-data:repeater dataSource="{container.item.cons}">
          <netui-data:repeaterHeader>
          </netui-data:repeaterHeader>
          <netui-data:repeaterItem>
          <netui-data:choiceMethod object="{pageFlow}" method="getAddHeader">
          <netui-data:methodParameter value="{container.item.contact_icon}" />
          </netui-data:choiceMethod>
          <netui-data:choice value="default">
          <td align="center" bgcolor="#FFCCCC" >
          <netui:checkBox tagId="con1" dataSource="{container.item.selContact}" defaultValue="{container.item.selContact}" />
          <netui:hidden dataSource="{container.item.contact_id}" tagId="conid1" />
          </td>
          </netui-data:choice>
          <netui-data:choice value="blue">
          <td align="center" bgcolor="#D8EBFE" >
          <netui:checkBox id="con2" dataSource="{container.item.selContact}" defaultValue="{container.item.selContact}" />
          <netui:hidden dataSource="{container.item.contact_id}" tagId="conid2" />
          </td>
          </netui-data:choice>
          <netui-data:choice value="green">
          <td align="center" bgcolor="#CCFFCC" >
          <netui:checkBox tagId="con3" dataSource="{container.item.selContact}" defaultValue="{container.item.selContact}" />
          <netui:hidden dataSource="{container.item.contact_id}" tagId="conid3" />
          </td>
          </netui-data:choice>
          <netui-data:choice value="yellow">
          <td align="center" bgcolor="#FFFFCC" >
          <netui:checkBox tagId="con4" dataSource="{container.item.selContact}" defaultValue="{container.item.selContact}" />
          <netui:hidden dataSource="{container.item.contact_id}" tagId="conid4" />
          </td>
          </netui-data:choice>
          </netui-data:repeaterItem>
          <netui-data:repeaterFooter>
          </netui-data:repeaterFooter>
          </netui-data:repeater>
          </tr>
          </netui-data:choice>
          <netui-data:choice value="false">
          <tr class="BlackNorm8" bgcolor="#eeeeee">
          
          
          <td colspan="2">
          <netui:label value="{container.item.eventName}" />
          <netui:hidden dataSource="{container.item.eventId}" />
          </td>
          <netui-data:repeater dataSource="{container.item.cons}">
          <netui-data:repeaterHeader>
          </netui-data:repeaterHeader>
          <netui-data:repeaterItem>
          <netui-data:choiceMethod object="{pageFlow}" method="getAddHeader">
          <netui-data:methodParameter value="{container.item.contact_icon}" />
          </netui-data:choiceMethod>
          <netui-data:choice value="default">
          <td align="center" bgcolor="#FFCCCC" >
          <netui:checkBox tagId="conalt1" dataSource="{container.item.selContact}" defaultValue="{container.item.selContact}" />
          <netui:hidden tagId="conidalt1" dataSource="{container.item.contact_id}" />
          </td>
          </netui-data:choice>
          <netui-data:choice value="blue">
          <td align="center" bgcolor="#D8EBFE" >
          <netui:checkBox tagId="conalt2" dataSource="{container.item.selContact}" defaultValue="{container.item.selContact}" />
          <netui:hidden tagId="conidalt2" dataSource="{container.item.contact_id}" />
          </td>
          </netui-data:choice>
          <netui-data:choice value="green">
          <td align="center" bgcolor="#CCFFCC" >
          <netui:checkBox tagId="conalt3" dataSource="{container.item.selContact}" defaultValue="{container.item.selContact}" />
          <netui:hidden tagId="conidalt3" dataSource="{container.item.contact_id}" />
          </td>
          </netui-data:choice>
          <netui-data:choice value="yellow">
          <td align="center" bgcolor="#FFFFCC" >
          <netui:checkBox tagId="conalt4" dataSource="{container.item.selContact}" defaultValue="{container.item.selContact}" />
          <netui:hidden tagId="conidalt4" dataSource="{container.item.contact_id}" />
          </td>
          </netui-data:choice>
          </netui-data:repeaterItem>
          <netui-data:repeaterFooter>
          </netui-data:repeaterFooter>
          </netui-data:repeater>
          </tr>
          </netui-data:choice>
          </netui-data:repeaterItem>
          <netui-data:repeaterFooter>
          </netui-data:repeaterFooter>
          </netui-data:repeater>
          Â </td>
          </tr>
          
          <tr bgcolor="#cccccc" class="BlackHeavy8">
          
          <td colspan="2">Select ALL</td>
          <netui-data:repeater dataSource="{pageFlow.contacts}" defaultText="Â ">
          <netui-data:repeaterHeader>
          </netui-data:repeaterHeader>
          <netui-data:repeaterItem>
          <netui-data:choiceMethod object="{pageFlow}" method="getAddHeader">
          <netui-data:methodParameter value="{container.item.contact_icon}" />
          </netui-data:choiceMethod>
          <netui-data:choice value="default">
          <td align="center" nowrap="true" bgcolor="#FFCCCC">
          <netui:hidden dataSource="{container.item.contact_id}" tagId="chbox1" />
          <input type="checkbox" value="false"
          onclick="selectAllEvents('chbox1')">Select ALL
          </td>
          </netui-data:choice>
          <netui-data:choice value="blue">
          <td align="center" nowrap="true" bgcolor="#D8EBFE">
          <netui:hidden dataSource="{container.item.contact_id}" tagId="chbox2" />
          <input type="checkbox" value="false"
          onclick="selectAllEvents('chbox2')">Select All
          </td>
          </netui-data:choice>
          <netui-data:choice value="green">
          <td align="center" nowrap="true" bgcolor="#CCFFCC">
          <netui:hidden dataSource="{container.item.contact_id}" tagId="chbox3" />
          <input type="checkbox" value="false" onclick="selectAllEvents('chbox3')">Select All
          </td>
          </netui-data:choice>
          <netui-data:choice value="yellow">
          <td align="center" nowrap="true" bgcolor="#FFFFCC">
          <netui:hidden dataSource="{container.item.contact_id}" tagId="chbox4" />
          <input type="checkbox" value="false" onclick="selectAllEvents('chbox4')">Select All
          </td>
          </netui-data:choice>
          </netui-data:repeaterItem>
          <netui-data:repeaterFooter></netui-data:repeaterFooter>
          </netui-data:repeater>
          </tr>
          
          </table>
          </td>
          <tr align="right">
          <td>
          <netui:button type="submit" value="Cancel" action="begin" styleClass="BlackNorm8"></netui:button>
          <netui:button value="Update" styleClass="BlackNorm8"/>
          </tr>
          </table>
          </netui:form>

hi ,
i dont know anything about delphi but from the experience from VB if the connection to oracle in delhpi doesnt recognise object type data field. Then try using OO4O drivers from oracle.if u use these drivers then u can access the sdo_geometry field !
Hope this helps
Vikesh

How can I use Javascript code to affect the display of textField?

Hi All,
I created a web application using JSF.
And Placed two controls: one Text Field and one Label.
On the Javascript onclick event of Label, I wrote the following javascript:
document.getElementById("form1:textField1").value="test123";
I run the web application, and click on the label, However, the text of the Text Field does not change.
But the following code shows text of the Text Field has been changed. it works.
alert(ocument.getElementById("form1:textField1").value);
So, why the display of the Text Field does not change? How to update the display of the Text Field?
Any suggestion will be helpful!
Thank you.

here is a full and correct example, enjoy
1. <html>
2. <%@ taglib uri="http://java.sun.com/jsf/core" prefix="f" %>
3. <%@ taglib uri="http://java.sun.com/jsf/html" prefix="h" %>
4. <f:view>
5. <head>
6. <title>
7. <h:outputText value="#{msgs.windowTitle}"/>
8. </title>
9. </head>
10. <body>
11. <h:form id="registerForm">
12. <table>
13. <tr>
14. <td>
15. <h:outputText value="#{msgs.namePrompt}"/>
16. </td>
17. <td>
18. <h:inputText/>
19. </td>
20. </tr>
21. <tr>
22. <td>
23. <h:outputText value="#{msgs.passwordPrompt}"/>
24. </td>
25. <td>
26. <h:inputSecret id="password"/>
27. </td>
28. </tr>
29. <tr>
30. <td>
31. <h:outputText value="#{msgs.confirmPasswordPrompt}"/>
32. </td>
33. <td>
34. <h:inputSecret id="passwordConfirm"/>
35. </td>
36. </tr>
37. </table>
38. <h:commandButton type="button" value="Submit Form"
39. onclick="checkPassword(this.form)"/>
40. </h:form>
41. </body>
42. <script type="text/javascript">
43. 
54. </script>
55. </f:view>
56. </html>

How can I use Paypal only when I check the box "pay with Paypal" and not when I check "pay cash" or "pay on my bank account number"

Hello,
Thanks for your time if you can help me solving this problem.
I have used Fromscentral for a long time now and it's really working fine but I can't find a solution for a simple problem I'll try to explain below.
Ok, My students can check which subscription they want :
1 art class 25€
3 month subscription 250€
6 month subscription 500€
When they have made that choice (only one) they can proceed and pay by Paypal.
But what happens if they want to pay their subscription at the studio in cash or if they want to wire the money on my bank account?
Well, it's not possible to select either of those two options and by doing so inactivate Paypal.
That's the problem.
Thanks to let me know how to do this
Phil

Hi,
In this scenario, I would suggest you to create another form for the cash and wire payments. This form can be embedded to the current form you have, students who wants to pay via cash or wire transfers; they can click on the link and fill their application separately.
Unfortunately, it is not possible to disable Paypal; using the conditional form elements.
Regards,
Nakul

How can i use a purchased version of Lion on a new Air to install on an existing iMac?

I have just bought a new Macbook air today which comes with Lion. I also have an iMac 27" at home already running Snow Leopard. Do I have to buy another copy of Lion for the iMac or am I entitled to use the installation I have with the Air? How would I go about getting Lion on the iMac in this case?

Yes, legally (and probably technically as well) you need to purchase Lion for your iMac. The copy that will come with your new MBA is licensed only for that system.
Regards.

How can I use apps that I have purchased from Apps Store for Mac on my iPad2?

how can I use apps that I have purchased from Apps Store for Mac on my iPad2?

Thanks, varjak, it is too easy to fall into use of jargon assuming everyone understands what it means.
One additional point in all of this, not all "iDevice" apps run on every "iDevice". Some are customized for a specific device, or class of devices such as the iPod/iPhone with their smaller screen. Others for just the iPads for their larger screens. So the user needs to be sure they are getting an app that will work on their specific device.
And to Phoneboone, you do need to purchase the app again if it is for a different class of equipment. When you are looking at apps such as iWorks for the Mac and iWorks components for the iPad, the iPad versions are very inexpensive. Pages is only $10 (US) which is really cheap for such a good word processor that reads and saves in the MS Word format.
Anyway, search for what you need and just enjoy the convenience of so many options for apps.

How can i use adobe creative suite 5 in macbook

how can i use adobe creative suite 5 in macbook?

I have already the adobe greative suite for Vista.Can I use it in a macbook?
Can I use Windows software in mac?

How can i use( API_SEMBPS_REFRESH) in my developement for Clearing Buffer

Hi All,
How can i clear the buffer values ??
How can i use( API_SEMBPS_REFRESH) in Web interface builder?
Any Inputs on this....
Thanks,
Edited by: NnSiri Siri on Oct 28, 2008 3:40 PM
Edited by: NnSiri Siri on Oct 28, 2008 8:58 PM
Edited by: NnSiri Siri on Oct 28, 2008 8:59 PM

Hi,
There are two ways to achieve this depending on how you want to refersh the web interface:
1. Anytime during the execution of web interface:
    a. Create a Z function module and insert a call to API_SEMBPS_REFRESH there.
    b. Then create a planning function exit and in Function Module field call your Z function module.
    c. Create a button in Web Interface and call the planning function exit on that button.
    This will call the refresh function whenever user will click on that button.
2. At the load of Web interface:
   a. Create a Z class in SE24 by copying the class CL_UPWB_BSP_APPL as super class.(This
       class is default application class for all web interfaces).
   b. Redfine LOAD method of your custom class and add call to FM API_SEMBPS_REFRESH.
   c. In your web interface, set the property 'Application Class' to your custom application class.
   This will call the refresh function every time you start the web interface.
If you will add your code in auto generated BSP application for your Web interface you have to re-write the logic in BSP application everytime you make change in your web interface and generates it in Web Interface builder. Because the system overwrites the BSP application everytime the Web interface is generated.
Regards,
Deepti
Edited by: Siegfried Szameitat on Nov 3, 2008 10:06 AM
deleted request for points.

How can i use javascript or php to check if an addon is already installed in my firefox? Thanks!

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