I just installed your suggested update to my Firefox. Now it doesn't work at all. I'm on Windows 8.1
My Firefox was unstable. I installed a "fix" that Mozilla sent me (via Firefox) without my asking. I installed it. Now Firefox does not work at all. It keeps loading websites but never completes the load. I am on Windows 8.1
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Reset Firefox...
The Reset Firefox feature can fix many issues by restoring Firefox to its factory default state while saving your bookmarks, history, passwords, cookies, and other essential information.
Note: After resetting Firefox, you will lose any extensions, toolbar customizations, and some preferences. See the Refresh Firefox - reset add-ons and settings article for more information.
To Reset Firefox:
- Open the Troubleshooting Information page using one of these methods:
- Click the menu button
, click help 
and select Troubleshooting Information. A new tab containing your troubleshooting information should open.
- If you're unable to access the Help menu, type about:support in your address bar to bring up the Troubleshooting Information page.
- Click the menu button
- At the top right corner of the page, you should see a button that says "Reset Firefox" that looks like this:
. Click on it.
- Firefox will close and reset. After it is done, Firefox will show a window with the information that is imported.
- Click Finish and Firefox will reopen.
If Resetting Firefox doesn't work...
Certain Firefox problems can be solved by performing a Clean reinstall. This means you remove Firefox program files and then reinstall Firefox. Please follow these steps:
Note: You might want to print these steps or view them in another browser.
- Download the latest Desktop version of Firefox from mozilla.org (or choose the download for your operating system and language from this page) and save the setup file to your computer.
- After the download finishes, close all Firefox windows (or open the Firefox menu and click the close button
).
- Delete the Firefox installation folder, which is located in one of these locations, by default:
- Windows:
- C:\Program Files\Mozilla Firefox
- C:\Program Files (x86)\Mozilla Firefox
- Mac: Delete Firefox from the Applications folder.
- Linux: If you installed Firefox with the distro-based package manager, you should use the same way to uninstall it - see Install Firefox on Linux. If you downloaded and installed the binary package from the Firefox download page, simply remove the folder firefox in your home directory.
- Windows:
- Now, go ahead and reinstall Firefox:
- Double-click the downloaded installation file and go through the steps of the installation wizard.
- Once the wizard is finished, choose to directly open Firefox after clicking the Finish button.
More information about reinstalling Firefox can be found here.
WARNING: Do not use a third party uninstaller as part of this process. Doing so could permanently delete your Firefox profile data, including but not limited to, extensions, cache, cookies, bookmarks, personal settings and saved passwords. These cannot be easily recovered unless they have been backed up to an external device! See Back up and restore information in Firefox profiles.
Izmjenjeno od strane You
Hello npappous, try to boot the computer in Windows Safe Mode with network support (also : http://support.microsoft.com/kb/2809468/en-us ) and then see if that helps. [select Enable Safe Mode with Networking]
Most often issues like that are caused by a firewall or/and security software which doesn't recognize new Firefox (and for that blocks the new firefox version). You have to remove all program rules for firefox from your firewall and let it detect the new version of the browser again.{In windows safe mode with networking security software is disable}
thank you