How to prevent adds to appear in firefox

In addition to the actual web page content, I always see unwanted content is displayed. Every page is intervened and at number of places on a web page the unwanted content is inserted. How to prevent this?

hello, maybe you have adware present on your computer. please try these steps:
# [[Reset Firefox – easily fix most problems|reset firefox]] (this will keep your bookmarks and passwords)
# afterwards go to firefox > addons > extensions and in case there are still extensions listed there, disable them.
# finally run a full scan of your system with different security tools like the [http://www.malwarebytes.org/products/malwarebytes_free free version of malwarebytes] and [http://www.bleepingcomputer.com/download/adwcleaner/ adwcleaner] to make sure that adware isn't present in other places of your system as well.
[[Troubleshoot Firefox issues caused by malware]]

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Re: "How do I add a device to Firefox Sync?" There is no link for add new device.

The code for the new device is some 21 alpha numeric characters long. Only a few of the characters fit in the three boxes -- they do not all fit.

The sync key is 26 characters and needs to be entered on the account page (I don't have the device), but if you have the code supplied by another device then you only have a code of 12 characters.
* https://support.mozilla.org/kb/how-do-i-set-up-firefox-sync
* https://support.mozilla.org/kb/add-a-device-to-firefox-sync
* https://support.mozilla.org/kb/find-code-to-add-device-to-firefox-sync

How do I add a spellchecker to firefox?

I need to be able to add some cabinet files to firefox for a specialized spellchecker. The exe file was set up for IE; it tries to work in Firefox saying it is installing, but it does not install. For IE installation I am given an alternative to unpack the CAB and install via INF, but I do not know how to do this in FireFox. Any help would be appreciated. Thanks!

Firefox has its' own spell check feature, see this:
https://support.mozilla.com/en-US/kb/Using+the+spell+checker
If you want to add your own spell check feature you need to visit the Mozilla Developer Center to learn how that is done.
https://developer.mozilla.org/En

How to prevent any website from bypassin firefox

I use FF15. Whe I have any web site open, a WANTED site, ANY other UNWANTED web site can either open on top of my current site, or open in the desktop BEHIND my current site. The only way I know these sites are there is the tab in the system tray, they are stacked on the desktop, or any audio, mostly ads, makes its way to my speakers. Not only is this annoying, but it interferes with streaming videos by making the stream slow to open, or JERKY in motion. The audio superimposes itself on the steams audio. How do I prevent this? OPERA and IE are not affected. Is there a stting I am missing? The pop up blocker is ON. There is no info in these HELP pages. HELP PLEASE!!!! [email protected]

Sometimes a problem with Firefox may be a result of malware installed on your computer, that you may not be aware of.
You can try some of the following programs to scan for malware:
* [http://www.malwarebytes.org/mbam.php MalwareBytes' Anti-Malware]
* [http://support.kaspersky.com/faq/?qid=208283363 TDSSKiller - AntiRootkit Utility]
* [http://windows.microsoft.com/MSE Microsoft Security Essentials] (A good permanent anti-virus if you don't already have one)
Further information can be found in the [[Troubleshoot Firefox issues caused by malware]] article.
Did this fix your problems? Please report back to us!

How do i add selection when closing firefox to save and quit, the tabs?

how do i save and quit when closing firefox?

'''cosmos''':
For illustrated example and explanation of entering/using '''''about:config''''' see: http://kb.mozillazine.org/About:config
 
 
'''Other issues needing your attention'''
The information submitted with your question indicates that you have out of date plugins with known security and stability issues that should be updated. To see the plugins submitted with your question, click "More system details..." to the right of your original question post. You can also see your plugins from the Firefox menu, Tools > Add-ons > Plugins. 
 
*Adobe PDF Plug-In For Firefox and Netscape "9.4.1"
*Next Generation Java Plug-in 1.6.0_20 for Mozilla browsers
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#*https://www-trunk.stage.mozilla.com/en-US/plugincheck/
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#'''Update Adobe Reader (PDF plugin):'''
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#**Click Help > Check for Updates
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#**If this method works for you, skip the "Download complete installer" section below and proceed to "After the installation" below
#*Download complete installer ('''if you do NOT have Adobe Reader installed'''):
#**Use the links below to avoid getting the troublesome "getplus" Adobe Download Manager and other "extras" you may not want
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#**Click the installer you just downloaded and allow the install to continue
#***Note: Vista and Win7 users may need to right-click the installer and choose "Run as Administrator"
#**'''Download link''': ftp://ftp.adobe.com/pub/adobe/reader/
#***Choose your OS
#***Choose the latest #.x version (example 9.x, for version 9)
#***Choose the highest number version listed
#****NOTE: 10.x is the new Adobe Reader X (Windows and Mac only as of this posting)
#***Choose your language
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#***Windows: choose the .exe file; Mac: choose the .dmg file
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#**''Also see Download link''': http://get.adobe.com/reader/otherversions/
#**Also see: https://support.mozilla.com/en-US/kb/Using+the+Adobe+Reader+plugin+with+Firefox (do not use the link on this page for downloading; you may get the troublesome "getplus" Adobe Download Manager (Adobe DLM) and other "extras")
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#'''Update the [[Java]] plugin''' to the latest version.
#*Download site: http://www.oracle.com/technetwork/java/javase/downloads/index.html (Java Platform: Download JRE)
#**'''''Be sure to un-check the Yahoo Toolbar option during the install if you do not want it installed.
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#* Removing old versions (if needed): http://www.java.com/en/download/faq/remove_olderversions.xml
#* Remove multiple Java Console extensions (if needed): http://kb.mozillazine.org/Firefox_:_FAQs_:_Install_Java#Multiple_Java_Console_extensions
#*Java Test: http://www.java.com/en/download/help/testvm.xml

How do I add a menubar to Firefox 2012?

I a have recently installed Firefox 12 and feel very lost without a menu bar.
Please advise how I find and add the menu bar?

press the alt-key, then go to view > toolbars > here you can enable the menu bar!

How do i add a shotcut to firefox for gmail

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Would you want to use the Bookmarks Toolbar? That would be simplest; otherwise, you would need some kind of add-on.
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How can I add Google toolbar on Firefox?

I had installed Google toolbar on Firefox webpage already but it doesn't appear the Google toolbar. Now I using Firefox 5.0.1

The Google Toolbar "will not be supported on Firefox 5 and future versions." 
http://googletoolbarhelp.blogspot.com/2011/07/update-on-google-toolbar-for-firefox.html
http://www.google.com/support/toolbar/bin/answer.py?answer=1342452&topic=15356%29
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https://addons.mozilla.org/en-US/firefox/addon/add-on-compatibility-reporter/
http://googlesystem.blogspot.com/2011/06/enable-google-toolbar-in-firefox-5.html

How do i add a protocol in firefox 4.0?

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How do I add Security Devices during Firefox deployment?

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Hello,
Thanks for posting on the Mozilla Support forum! I have just escalated this thread but of a 'no response' to this thread in the last 72 hours. Please accept my apologies for this inconvenience and be rest assured that a member of our Advanced Troubleshooting team will be with you in 24-48 hours.
Thank you
Best Regards, 
feer56
PS: You may want to update to version 19.0.2 or wait a few days for version 20.

How to prevent adds to appear in firefox

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