WinXP FireFox 3.6.25 After updating FF reverts back to 3.6.25 on next open.

Tried uninstall, reboot. 3.6.25 reinstalled itself on reboot. Any ideas?

Thank you Matt_G and cor-el. I use ZoneAlarm Free Firewall and Panda Cloud Free antivirus. After another round of FireFox reverting itself I renamed c:\Program Files > Mozilla Firefox" after again uninstalling (keeping extensions and plugins as before) to"X-Mozilla Firefox" then reinstalled from the mozilla download page. This has corrected the problem. I was surprised to see that my extensions and plugins also installed along with the new 9.0.1 version(??). In the old program folder some of the subfolders are duplicated(2). I'll now delete the backed up "X-Mozilla Firefox" folder as I don't expect any more issues.

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Firefox won't start after update - nothing in support pages helps

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-> [[Firefox will not start]]
Check and tell if its working.

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Firefox 4 is not compatible with the skin i had been using for my browser, old factory black... i would prefer to keep this skin rather than use firefox 4... how can i revert back to the previous version of firefox?...

''Duplicate post, continue here - [https://support.mozilla.com/en-US/questions/816154]''
firefox 4 is not compatible with the skin i had been using for my browser, old factory black... i would prefer to keep this skin rather than use firefox 4... how can i revert back to the previous version of firefox?...

Older versions of Firefox are available here:
http://www.mozilla.com/en-US/firefox/all-older.html

Firefox no longer working after update to 19.0.2

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Hello vinaysingh, check if your Internet security software (including firewalls, antivirus programs, anti-spyware programs, and more) preventing Firefox from connecting to the Internet.
see for more info : [https://support.mozilla.org/en-US/kb/fix-problems-connecting-websites-after-updating#os=win7&browser=fx19 Fix problems connecting to websites after updating Firefox]
thank you

Firefox is unbearably slow after updating to version 27

After updating to Firefox 27 all webpages take a few dozen seconds to several minutes to load. When loading a webpage Firefox's status displays "connecting" and the CPU gets maxed out with 95 to 100% of its cycles taking by Firefox.
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CPU: AMD Athlon 2800+ 2.08GHz
RAM: 1GB
OS: Windows XP Home Edition Service Pack 3 32bit
Comments by a forum moderator. (Modified April 30, 2014 12:11:58 PM BST by John99 ) ~J99 
Rather a long thread so I will add some comments here where easily seen.
* For general problems please see my post [/questions/985969?page=3#answer-546520] Updated 30th April 2014 to mention the outstanding known issue (aka the bug with only three votes)
* Just below that ''jigebren'' has kindly summarised some workarounds at that particular time and the issues found from this thread [/questions/985969?page=3#answer-546599]
Modified June 18, 2014 6:08:41 AM PDT by John99
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I had a very similar issue on a similar computer (Windows XP SP3, Pentium 4 2.4GHz, Nvidia GeForce FX 5500), and it came down that in my case the slowdown was simply introduced by animations (I believe the simple rotating icon on the tab was enough to slow the loading of a webpage).
The CPU used to reach around 100% in [https://en.wikipedia.org/wiki/Windows_Task_Manager#Performance Kernel mode] (for info this is the red line in the Windows Task Manager. To enable it go to the "Performances" tab then in the "View" menu ensure "Show kernel times" is selected).
To know if you face the same issue:
* Type "about:support" in the address bar and press Enter.
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* Search for "gfx.content.azure.backends".
* The value should be "direct2d,cairo". Edit it to be simply "direct2d" (ie. remove "cairo"), then restart Firefox.
I have already filled a bug report which can be found here:
https://bugzilla.mozilla.org/show_bug.cgi?id=973149
Feel free to add feedback if you have the same issue.

Firefox does not start after updates

Every time i get an update, download it and restart Firefox, it does not restart and i have to run the set file again. It means too that the updates have not been dowl=nloaded !
Windows 7 ultimate. 4Gb ram 1 Tb Regards

I AM ABSOLUTELY SICK-SICK-SICK OF THIS PROBLEM. I HAVE TRIED EVERYTHING BUT IT STILL DOES NOT RESTART AFTER UPDATES. I HAVE DELETED/CREATED NEW PROFILES, DONE CLEAN INSTALLS - NO CHANGE!!!
I HAVE CHECKED FOR VIRUSES - NOTHING. CLEAN. I AM ABOUT READY TO GIVE UP AND SEND A LETTER TO A LOCAL TECH/MEDIA PERSON SO THAT THEY CAN WRITE AN ARTICLE ABOUT THIS ISSUE THAT FOR SOME REASON MANY OTHERS HAVE AS WELL AND YOU=MOZILLA HAVE NOT OFERED ANYTHING CLOSE TO A SATISFACTORY RESPONSE, EXPLANATION, FIX, ETC ETC ETC

Firefox Not Loading Websites After Update

''locking this thread as duplicate, please continue at [https://support.mozilla.org/en-US/questions/1053378 /questions/1053378]''
Firefox has stopped working after latest update. I can open it up but then it wont load any websites. It just keeps loading. After if I close it and try to re-open it I get the following error message: "Firefox is already running, but not responding. The old firefox process must be closed to open a new window" and it never opens. If I try to end the process in task manager I can't as it doesn't do anything when I attempt to end the process. Then the only way I can get back on firefox is to restart my computer. This is happening on both my PC and my Laptop both running Norton Security Suite.
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2) Refresh Firefox
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It is possible that your security software (firewall, anti-virus) blocks or restricts Firefox or the plugin-container process without informing you, possibly after detecting changes (update) to the Firefox program.
Remove all rules for Firefox and the plugin-container from the permissions list in the firewall and let your firewall ask again for permission to get full, unrestricted, access to install for Firefox and the plugin-container process and the updater process.
See:
*https://support.mozilla.org/kb/Server+not+found
*https://support.mozilla.org/kb/Firewalls
*https://support.mozilla.org/kb/fix-problems-connecting-websites-after-updating
Boot the computer in Windows Safe Mode with network support (press F8 on the boot screen) as a test.
*http://www.bleepingcomputer.com/tutorials/how-to-start-windows-in-safe-mode/

Firefox won't start after updating

Firefox recently completed an auto-update, however now the software won't load.
If I click on the Firefox icon, I get the Windows egg timer for about 10 seconds, then the pointer reverts to normal and nothing happens. If I open Task Manager at the same time, when I click on the Firefox icon, I see the application listed for approximately 5 seconds, then it's removed from the list.
I have tried running in compatibility mode, as well as removing and re-installing, neither of which have helped.
Can you advise, please ?

It is possible that your security software (firewall, anti-virus) blocks or restricts Firefox or the plugin-container process without informing you, possibly after detecting changes (update) to the Firefox program.
Remove all rules for Firefox and the plugin-container from the permissions list in the firewall and let your firewall ask again for permission to get full unrestricted access to internet for Firefox and the plugin-container process and the updater process.
See:
*https://support.mozilla.org/kb/Server+not+found
*https://support.mozilla.org/kb/Firewalls
*https://support.mozilla.org/kb/fix-problems-connecting-websites-after-updating
Boot the computer in Windows Safe Mode with network support (press F8 on the boot screen) as a test to see if that helps.

Firefox won't load after update on 12/9/14

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hello Reh3335, normally such issues are caused by a firewall/security software which doesn't recognize & therefore blocks new firefox versions. please remove all program rules for firefox from your firewall and let it detect the new version of the browser again.
[[Fix problems connecting to websites after updating Firefox]]

Unable to open https websites with Firefox 4 beta 5 after updating from beta4

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this is the fourth time i have had to type this question out. what a terrible lay out for a support section!

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Hi ..
Try this discussion > Can't connect to Juniper VPN

Firefox will not run after update (3.6 8.0) WinXP

I noticed that my mother's laptop was running Firefox 3.6 still, and offered to update. I downloaded 8.0, and ran the install. Had no issues with the install, no errors, nothing. I told it to run after the install finished, and it never came up. I tried the icon, still nothing. I downloaded Firefox 7.0, and installed it, figuring there might have been an issue with 8.0, since it just came out, nd tried it, same result. I rebooted the system, and tried again, still nothing happens, just the little hourglass for a moment, and then.. nothing. There is nothing in the task manager, no process for firefox. I tried running the profile manager and the plain program from the run under the start menu of windows with antivirus turned off, and got nothing there either.
I'm running windows XP Pro
::edit::
I was able to re-instal 3.6.24 back over top, and it works, but I would like to update it for her still, if it can be done.

A possible cause is security software (firewall) that blocks or restricts Firefox or the plugin-container process without informing you, possibly after detecting changes (update) to the Firefox program.
Remove all rules for Firefox from the permissions list in the firewall and let your firewall ask again for permission to get full unrestricted access to internet for Firefox and the plugin-container process and the updater process.
See:
*https://support.mozilla.com/kb/Server+not+found
*https://support.mozilla.com/kb/Firewalls

Firefox does not work after update, all troubleshooting has been completed. Nothing can be clicked, not even the options in firefox.

I am unable to use firefox after the latest update. All troubleshooting methods listed on the website has been tried. I am unable to click anything in the firefox, tabs don't work, options don't work, unable to launch diagnotics, help or anything from firefox. Basically, I am unable to access anything within firefox.

Did you try a new profile?
Create a new profile as a test to check if your current profile is causing the problems.
See "Creating a profile":
*https://support.mozilla.org/kb/profile-manager-create-and-remove-firefox-profiles
*http://kb.mozillazine.org/Standard_diagnostic_-_Firefox#Profile_issues
If the new profile works then you can transfer some files from an existing profile to the new profile, but be careful not to copy corrupted files.
*http://kb.mozillazine.org/Transferring_data_to_a_new_profile_-_Firefox
Do a clean reinstall and delete the Firefox program folder before (re)installing a fresh copy of the current Firefox release.
Download a fresh Firefox copy and save the file to the desktop.
*Firefox 23: http://www.mozilla.org/en-US/firefox/all.html
Uninstall your current Firefox version, if possible, to cleanup the Windows registry and settings in security software.
*Do NOT remove personal data when you uninstall your current Firefox version, because all profile folders will be removed and you lose personal data like bookmarks and passwords from profiles of other Firefox versions.
Remove the Firefox program folder before installing that newly downloaded copy of the Firefox installer.
*(32 bit Windows) "C:\Program Files\Mozilla Firefox\"
*(64 bit Windows) "C:\Program Files (x86)\Mozilla Firefox\"
*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.
*http://kb.mozillazine.org/Uninstalling_Firefox
Your bookmarks and other personal data are stored in the Firefox profile folder and won't be affected by an uninstall and (re)install, but make sure that "remove personal data" is NOT selected when you uninstall Firefox.
*http://kb.mozillazine.org/Profile_folder_-_Firefox
*http://kb.mozillazine.org/Profile_backup
*http://kb.mozillazine.org/Standard_diagnostic_-_Firefox#Clean_reinstall

WinXP FireFox 3.6.25 After updating FF reverts back to 3.6.25 on next open.

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