Getting an Error Message in Firefox?

If you're getting the following error message:
"A copy of Firefox is already open. Only one copy of Firefox can be open at a time."
Here's the solution:
Open the application "Terminal" (in your utilities folder) and type in the magic words below;
/Applications/Firefox.app/Contents/MacOS/firefox-bin -profilemanager
(if your Firefox is in the Applications Folder; if not, change the beginning)
Create a new profile (might want to call it 'firefox profile') and start firefox!
Good luck!

Your More system details list shows that you use Firefox 4:
*Mozilla/5.0 (Windows NT 6.1; rv:2.0) Gecko/20100101 Firefox/4.0
Are you trying to (re)install Firefox 4 or do you get that error if you start Firefox?
Do a clean (re-)install:
* Download a fresh Firefox copy and save the file to the desktop.
* Firefox 4.0: http://www.mozilla.com/firefox/all.html
* Uninstall your current Firefox version and remove the Firefox program folder before installing that copy of the Firefox installer.
* Don't remove personal data if you uninstall the current version.
* It is important to delete the Firefox program folder to remove all the files and make sure that there are no problems with files that were leftover after uninstalling.
Your bookmarks and other profile data are stored elsewhere (not in the Firefox program folder) and won't be affected by a reinstall, but make sure that you do not select to remove personal data if you uninstall Firefox.
If that still doesn't work then create a new profile as well.
See [[Basic Troubleshooting#Make_a_new_profile|Basic Troubleshooting: Make a new profile]]
If that new profile works then you can transfer some files from the old profile to that new profile (be careful not to copy corrupted files)
* http://kb.mozillazine.org/Transferring_data_to_a_new_profile_-_Firefox

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I'm getting an error message from Firefox that says, "Something is trying to trick Firefox into accepting an insecure update. Please contact your network provider and seek help."

I'm getting an error message from Firefox that says, "Something is trying to trick Firefox into accepting an insecure update. Please contact your network provider and seek help." Do you know what is going on here--what this problem could be? (I do have the latest Firefox version already installed. I have previously received Firefox error messages that say "Firefox Update Failed." However, I already had the latest Firefox version installed when I received those error messages.)

Apparently this occurs when Firefox has problems with security certificates. There have been a few questions about this. I will try to get advice about this.
Apparently you are using Internet Explorer 9 (From your system details). Do you have Google Updater plugin installed on Firefox ?
(That been implicated in this sort of problem by one poster, and some users with the problem do have Google Updater, but some do not)

I run mac os 10.4.11 and firefox 7 will not open, and I get an error message saying firefox is not supported on this version of mac os. is there a different version I can download? Am I missing something?

firefox used to work no problem, I updated firefox a few month ago, now firefox will not open and I get the error message as above

As of Firefox 4.0 and newer one needs both OSX 10.5+ and a Intel Mac.
The last version to work on a Intel Mac using OSX 10.4.* is Firefox 3.6.*
http://www.mozilla.org/en-US/firefox/all-older.html
http://www.mozilla.org/en-US/firefox/7.0/system-requirements/
http://www.mozilla.org/en-US/firefox/4.0/system-requirements/
http://www.mozilla.org/en-US/firefox/3.6/system-requirements/

When I open any web page I get this error message with Firefox 4...Javascript Application Uninstall Set

When I load web pages with Firefox 4, I get this error message
Javascript Application Uninstall Set

When I load web pages with Firefox 4, I get this error message
Javascript Application Uninstall Set

Why do I get this error message /opt/firefox/run-mozilla.sh: 399: /opt/firefox/firefox-bin: not found

kubuntu 10.04
firefox 10.0.2
I downloaded and installed firefox 10.0.2 but when I...
1. click the desktop icon nothing happens.
2. use terminal mode and type firefox I get the following error message:
/opt/firefox/run-mozilla.sh: 399: /opt/firefox/firefox-bin: not found
How do I fix this?

In short, I used kpackagekit to uninstall firefox. Then used synaptic to uninstall firefox. After that I manually scanned the computer for residual DIRs. In the end, I noticed that I still had 3 DIRs containing firefox: /opt/firefox, /usr/lib/firefox-10.0.1, /usr/lib64/firefox-10.0.1
So removing firefox didn't work as expected.
As it turns out, the copy of firefox residing in /opt/firefox is v3.5.3, but I have a current version in /usr/lib and /usrlib64. For some reason the, new install didn't replace the copy in /opt/firefox and the /usr/bin scripts firefox and run-mozilla.sh point to /opt/firefox.
So when I use terminal mode and type firefox I get the cited error message. When I use my desktop icon it hangs.
My remedy for this was to due the following:
1. track down the location of the desktop icon: /usr/share/applications/firefox.desktop
2. edit the file: sudo pico /usr/share/applications/firefox.desktop
3. modify entry to: EXEC=/usr/lib/firefox-10.0.1 /firefox.sh u% ( save and exit)
4. modify terminal command: firefox
5. track down the location of the firefox command: /usr/bin/firefox and /usr/bin/
firefox.ubuntu
6. remove symbolic link: rm /usr/bin/firefox
7. remove symbolic link: rm /usr/bin/firefox
8. create new symbolic link: ln -sT /usr/lib/firefox-10.0.1/firefox.sh firefox
9. create new symbolic link: ln -sT /usr/lib/firefox-10.0.1/firefox.sh firefox.ubuntu
Everything works now as it should.
I believe the cause of this problem was related to the fact that the mozilla-team made a change to the location of their upgrade/update libraries which affected the entries in the file: /etc/apt/sources.list. When the ppa library location changed, my kubuntu version 10.04 didn't make this change and residual copies of firefox were left behind and DIRs /usr/bin and /opt/firefox were not modified.
Perhaps my experience will help others that tread this path.
Maybe somebody can explain to me why we need 3 DIRs for firefox: /opt/fire ; /usr/lib ; /usr/lib64

Norton deleted the "getplusplus_adobe_reg.exe" file and now I get an error message in Firefox

I recently installed the newest version of Adobe Flash Player. As I was installing the program, Norton Internet Security said that the "getplusplus_adobe_reg.exe" file was suspect, so I deleted it. Now, every time I load Firefox, I get an error message saying that file is missing, and some websites do not function properly. I tried uninstalling and re-installing Firefox, and this did not solve the problem.
== This happened ==
Every time Firefox opened
== I installed the newest Adobe Flash Player version

Getplus is the problematic Adobe Download Manager (DLM) which no one needs. See if the suggestions in the following will help you to get rid of it: http://secunia.com/community/forum/thread/show/3665/adobe_dlm_will_not_uninstall
When updating or installing Adobe Flash (aka Shockwave Flash) follow these instructions (NOTE: you have the most current version installed):
'''Install/Update Adobe Flash Player for Firefox (aka Shockwave Flash)''': your ver. 10.0 r22; current ver. 10.1 r53 ('''important security update 2010-06-10''')
~~red:Check your version here~~: http://www.mozilla.com/en-US/plugincheck/
See: '''[http://support.mozilla.com/en-US/kb/Managing+the+Flash+plugin#Updating_Flash Updating Flash]'''
-'''use Firefox to download''' and '''SAVE to your hard drive''' (save to Desktop for easy access)
-exit Firefox (File > Exit)
-check to see that Firefox is completely closed (''Ctrl+Alt+Del, choose Task Manager, click Processes tab, if "firefox.exe" is on the list, right-click "firefox.exe" and choose End process, close the Task Manager window'')
-double-click on the Adobe Flash installer you just downloaded to install/update Adobe Flash
-when the Flash installation is complete, start Firefox, and test the Flash installation here: http://kb.adobe.com/selfservice/viewContent.do?externalId=tn_15507&sliceId=1
*'''NOTE: On Vista and Windows 7''' you may need to run the plugin installer as Administrator by starting the installer via the right-click context menu if you do not get an UAC prompt to ask for permission to continue (i.e nothing seems to happen). See this: http://vistasupport.mvps.org/run_as_administrator.htm
*'''NOTE for IE:''' Firefox and most other browsers use a Plugin. IE uses an ActiveX version of Flash. To install/update the IE ActiveX Adobe Flash Player, same instructions as above, except use IE to download the ActiveX Flash installer.
*Also see: http://kb.mozillazine.org/Flash ~~red:'''''AND'''''~~ [[How do I edit options to add Adobe to the list of allowed sites]]
'''''Other Issues''''': ~~red:You have installed plug-ins with known security issues. You should update them immediately.~~
'''Update Java''': your ver. 1.5.0_04 (~~red:very old~~); current ver. 1.6.0.20 (important security update 04-15-2010)
(~~red:Firefox 3.6 and above requires Java 1.6.0.10 or higher~~; see: http://support.mozilla.com/en-US/kb/Java-related+issues#Java_does_not_work_in_Firefox_3_6 )
''(Windows users: Do the manual update; very easy.)''
~~red:Check your version here~~: http://www.mozilla.com/en-US/plugincheck/
See: '''[http://support.mozilla.com/en-US/kb/Using+the+Java+plugin+with+Firefox#Updates Updating Java]'''
Do the update with Firefox closed.
'''You''' ~~red:'''MAY'''~~ '''need to Update Adobe Reader for Firefox''': your ver. N/A; current ver. 9.3.2
~~red:Check your version here~~: http://www.mozilla.com/en-US/plugincheck/
See: http://support.mozilla.com/en-US/kb/Using+the+Adobe+Reader+plugin+with+Firefox#Installing_and_updating_Adobe_Reader
''You may be able to update from the Adobe Reader installed on your system'' instead of going to the Adobe site and downloading. Start > Program Files, find and click Adobe Reader to open, click Help, click Check for Updates.
''If you go to the Adobe site to download the current Adobe Reader:''
-'''use Firefox to download''' and '''SAVE to your hard drive''' (save to Desktop for easy access)
~~red:-See the images at the bottom left of this post to see the steps to take on the Adobe site~~
-exit Firefox (File > Exit)
-check to see that Firefox is completely closed (''Ctrl+Alt+Del, choose Task Manager, click Processes tab, if "firefox.exe" is on the list, right-click "firefox.exe" and choose End process, close the Task Manager window'')
-double-click on the Adobe Reader installer you just downloaded to install/update Adobe Reader
*'''NOTE: On Vista and Windows 7''' you may need to run the plugin installer as Administrator by starting the installer via the right-click context menu if you do not get an UAC prompt to ask for permission to continue (i.e nothing seems to happen). See this: http://vistasupport.mvps.org/run_as_administrator.htm
*'''NOTE for IE:''' Firefox and most other browsers use a Plugin. IE uses an ActiveX version. To install/update the IE ActiveX version, same instructions as above, except use IE to download the ActiveX installer.
*Also see: http://kb.mozillazine.org/Adobe_Reader ~~red:'''''AND'''''~~ [[How do I edit options to add Adobe to the list of allowed sites]]

I get an error message before firefox opens. it is : TypeError : componentsclasses[TvtpwmComponent_CID]is undefined

''Duplicate post, continue here - [https://support.mozilla.com/en-US/questions/787560]''
Everytime I open Firefox - I get the error message above. I hit ok and then firefox opens.
Why am i getting this message?
I have uninstalled and reinstalled Firefox and still get the message.

That points to a problem with an extension that may not be compatible with Firefox 4 beta, possibly the Lenovo password manager.
If you have the Lenovo password manager try disabling it. Click the Firefox button, then select Add-ons. In the list of Extensions click on the password manager to select it, then click the Disable button. Re-start Firefox to see if that solves the problem. If you do not have the Lenovo password manager, repeat the above process with the other extensions to identify what one is causing this. The following link has further details on troubleshooting - https://support.mozilla.com/kb/Troubleshooting+extensions+and+themes

I am trying to log in to my MSN Hotmail e-mail account, and after entering my login info, I get the error message that Firefox cannot find the server. Why not?

When trying to log into my MSN Hotmail account (@msn.com), after I enter my credentials, Firefox gives me an error message that "Firefox can't find the server at blu152.mail.live.com". I am able to log in easily from the same computer using Internet Explorer. I think this problem just started yesterday. Why is Firefox unable to connect to my e-mail account?

Clear the cache and the cookies from websites that cause problems.
"Clear the Cache":
*Firefox/Tools > Options > Advanced > Network > Cached Web Content: "Clear Now"
"Remove Cookies" from sites causing problems:
*Firefox/Tools > Options > Privacy > Cookies: "Show Cookies"

Everytime I click on the icon, I get an error message. Firefox doesn't even load. Any suggestions on how to fix this?

Firefox won't open at all.
Error Meassage: Firefox had a problem and crashed. We'll try to restore your tabs and windows when it restarts. Unfortunately the crash reporter is unable to submit a crash report. Details: The application did not leave a crash dump file.
I've restarted my computer and I've tried a system restore. I've also unintstalled and reinstalled firefox.
Sometimes, I may get the crash report, but if I click Restart Firefox, that error message will just pop up.

Make sure that you have iTunes installed properly and that the program has registered the itpc: protocol.
See http://kb.mozillazine.org/Register_protocol

I get the error message in Firefox 5 "Sync encountered an error while syncing: Unknown error. Sync will automatically retry this action."

Hello Firefox support. I just started working on a 64 bit Windows 7 machine running Firefox 5 and am constantly getting the following Sync error: "Sync encountered an error while syncing: Unknown error. Sync will automatically retry this action." I can't find an accurate solution on the web. Please help!

Exact same error message here here. Haven't checked our other systems. This one is:
* Firefox 5
* Canonical 1
* Ubuntu Linux 10.04 LTS

I keep getting this error message and Firefox won't start....Exc in ev handl: Error: Error setting property on NPObject!

Firefox won't start and this message keeps coming up....I uninstalled and reinstalled....but didn't help...
Exc in ev handl: Error: Error setting property on NPObject!

Disable "McAfee Site Advisor" extension which was just updated to 3.4.0, which probably took it out of the addons block list.
* "Ctrl+Shift+A" > find McAfee Site Advisor and use "Disable", and then restart Firefox.
* Do a Google Search no problem
* It seems that if you re-enable Site Advisor again, and restart Firefox you are okay. At least you know where to look if you get the error again or Google searches slow down.

How can I stop getting the error message of firefox not being permitted into a website?

Okay so yesterday while on my school site trying to do work and access my course, this error message popped up saying either my internet connection is not good, which it is working, or that the website is busy but it wasn't so it had to be with my firewall and firefox. So I went to firefox website to see if I can fix it, I did what they said to do and to remove firefox from the list of programs I'm allowing in and then to allow it back in. And it didn't work. So i updated firefox and it worked perfectly.
Until today, I tried to access my course and it popped up with the same message. So I tried to do what I did yesterday with removing it from the list and allowing it back in but it didn't work. And firefox is up to date so I honestly don't know what else to do. Can you help?

Sounds like you were 'fixing' the firewall for Firefox access. If Firefox is working everywhere except your school website, I doubt if your issue is with the firewall.
Please provide a screenshot of that error message.
https://support.mozilla.org/en-US/kb/how-do-i-create-screenshot-my-problem
It is best to use a compressed image type like PNG or JPG to save the screenshot and make sure that you do not exceed a maximum file size of 1 MB.
Then use the '''Browse ....''' button below the '''''Post a Reply''''' text box to upload the screenshot.

Since installing 3.6.12, firefox crashes continuously...I have gone back to Windows Explorer because firefox does not run anymore. Upon any actioin in firefox, the screen goes white and freezes and I get an error message saying firefox has stopped working

just about any action in firefox will cause a "WHITE SCREEN" freeze up and then an error message stating that firefox has stopped working. This happens in EVERY sessioin of firefox.

I have had a similar problem with my system. I just recently (within a week of this post) built a brand new desktop. I installed Windows 7 64-bit Home and had a clean install, no problems. Using IE downloaded an anti-virus program, and then, because it was the latest version, downloaded and installed Firefox 4.0. As I began to search the internet for other programs to install after about maybe 10-15 minutes my computer crashes. Blank screen (yet monitor was still receiving a signal from computer) and completely frozen (couldn't even change the caps and num lock on keyboard). I thought I perhaps forgot to reboot after an update so I did a manual reboot and it started up fine.
When ever I got on the internet (still using firefox) it would crash after anywhere between 5-15 minutes. Since I've had good experience with FF in the past I thought it must be either the drivers or a hardware problem. So in-between crashes I updated all the drivers. Still had the same problem. Took the computer to a friend who knows more about computers than I do, made sure all the drivers were updated, same problem. We thought that it might be a hardware problem (bad video card, chipset, overheating issues, etc.), but after my friend played around with my computer for a day he found that when he didn't start FF at all it worked fine, even after watching a movie, or going through a playlist on Youtube.
At the time of this posting I'm going to try to uninstall FF 4.0 and download and install FF 3.6.16 which is currently on my laptop and works like a dream. Hopefully that will do the trick, because I love using FF and would hate to have to switch to another browser. Hopefully Mozilla will work out the kinks with FF 4 so I can continue to use it.
I apologize for the lengthy post. Any feedback would be appreciated, but is not necessary. I will try and post back after I try FF 3.16.6.

Hi. I keep getting this error message on Firefox, even trying to open help pages through Firefox.

fhr.cdn.mozilla.net uses an invalid security certificate. The certificate is not trusted because no issuer chain was provided. (Error code: sec_error_unknown_issuer)

Check out why the site is untrusted (see the Technical details) and if this is caused by a missing intermediate certificate then see if you can install this intermediate certificate from another source.
You can retrieve the certificate and check details like who issued certificates and expiration dates of certificates.
* Click the link at the bottom of the error page: "I Understand the Risks"
Let Firefox retrieve the certificate: "Add Exception" -> "Get Certificate".
* Click the "View..." button and inspect the certificate and check who is the issuer.
You can see more Details like intermediate certificates that are used in the Details pane.
Please try clearing cache and cookies. Please also make sure that you date and time of your pc is correct as this may be the cause as well.

I get this error message before Firefox crashes A script on this page may be busy, or it may have stopped responding. You can stop the script now, or you can co

Can you help? Thank you for all you do.
Kimberly
I get this message and then firefox crashes all while I am in google calendar accessing the tasks menu in google calendar through my gmail account
A script on this page may be busy, or it may have stopped responding. You can stop the script now, or you can continue to see if the script will complete.
Script: resource://firefox-at-gingersoftware-dot-com/api-utils/lib/loader.js -> resource://firefox-at-gingersoftware-dot-com/api-utils/lib/sandbox.js -> resource://firefox-at-gingersoftware-dot-com/api-utils/lib/content/content-proxy.js:776

If you have submitted crash reports then please post the IDs of one or more crash reports that have this format:
*bp-xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
You can find the IDs of the submitted crash reports on the about:crashes page.
*You can open the about:crashes page via the location bar, like you open a website.
See:
*http://kb.mozillazine.org/Mozilla_Crash_Reporter
*https://support.mozilla.org/kb/Mozilla+Crash+Reporter
If you can't open Firefox then see:
*http://kb.mozillazine.org/Mozilla_Crash_Reporter#Location_of_crash_reports
*http://kb.mozillazine.org/Mozilla_Crash_Reporter#Viewing_crash_reports
*https://developer.mozilla.org/en/How_to_get_a_stacktrace_for_a_bug_report
See also:
*http://kb.mozillazine.org/Firefox_crashes
*https://support.mozilla.org/kb/Firefox+crashes
Start Firefox in [[Safe Mode|Safe Mode]] to check if one of the extensions (Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance).
*Do not click the Reset button on the Safe mode start window or otherwise make changes.
*https://support.mozilla.org/kb/Safe+Mode
*https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes
Try to set the network.http.spdy prefs to false on the about:config page.
*network.http.spdy.enabled
*network.http.spdy.enabled.v2
*network.http.spdy.enabled.v3
*http://kb.mozillazine.org/about:config

Getting an Error Message in Firefox?

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