The Reset Firefox feature can fix many issues by restoring Firefox to its factory default state while saving your essential information. Note: This will cause you to lose any Extensions, Open websites, and some Preferences.

To Reset Firefox do the following:

1. Go to Firefox > Help > Troubleshooting Information.
2. Click the "Reset Firefox" button.
3. Firefox will close and reset. After Firefox is done, it will show a window with the information that is imported. Click Finish.
4. Firefox will open with all factory defaults applied.

Further information can be found in the Refresh Firefox - reset add-ons and settings article.

Did this fix your problems? Please report back to us!

I had already tried that in the first place. No, it didn't help, I'm currently back to 19.0.2

Start Firefox in 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

If there are problems with updating then do a clean reinstall and delete the Firefox program folder before reinstalling a fresh copy of Firefox.

Download a fresh Firefox copy and save the file to the desktop.

• Firefox 20.0.x: 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 will also lose your 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.

• 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 profile 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.

If you keep having problems then also create a new profile.

• http://kb.mozillazine.org/Profile_folder_-_Firefox
• http://kb.mozillazine.org/Profile_backup

• http://kb.mozillazine.org/Standard_diagnostic_-_Firefox#Clean_reinstall

safe mode: did not help create a new profile: did not help uninstall through control panel, remove installation folder, do a fresh install: did not help (but removed lots of cruft - thanks for that :-) reinstall 19.0.2: this always helps

A possible cause is security software (firewall,anti-virus) 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 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

Try to boot the computer in Windows Safe mode with network support (press F8 on the boot screen) as a test to see if that helps.

I'm behind a corporate firewall, so the box Firefox is running on does not have a firewall of its own. And once again, the problem is not that I cannot connect to web servers (bookmarks, links, and new tab tiles do work). The problem is that pressing Enter does not cause Firefox to even attempt to connect. NB the Enter key is not disabled per se - if I enter "google.de" and hit Enter, the address bar entry is expanded to "https://www.google.de", but then there is no indication that Firefox attempts to connect to that page - no running circle in the tab, no error message, nothing. This also affects local pages. I can't open them through the address bar (file:///path/to/foo.html), but they open fine if I use File->Open File instead. All this makes me think that there is no firewall problem.

As for anti-virus software, the box runs "Sophos Endpoint Security and Control" but I'm not in a position to switch it off for testing purposes.

Forgot to mention initially that booting in Safe mode with network support did not correct the problem either.

Same issue here. We're running Win 7 x64 SP1... Symantec Endpoint Protection.

I have done all you have as well... uninstall/reinstall Firefox. Reset Firefox. Safe Mode Firefox. Disable anti-virus... no luck.

The bookmarks work and previous sites work, but nothing typed into the address bar works and pressing enter has no visible effect.

It's definitely a bug, not a firewall issue or security software issue.

I've found nothing here works either: - https://support.mozilla.org/en-US/kb/reset-preferences-fix-problems - https://support.mozilla.org/en-US/kb/troubleshoot-issues-with-plugins-fix-problems - https://support.mozilla.org/en-US/kb/troubleshoot-extensions-themes-to-fix-problems?redirectlocale=en-US&redirectslug=Troubleshooting+extensions+and+themes - https://support.mozilla.org/en-US/kb/troubleshoot-and-diagnose-firefox-problems

So this must be a core issue with the software. Since on the first day already 13 others have found your support article and said "me too"... Hopefully Mozilla can recreate the issue and get a fix out quick.

Hey I have the same, and also I have Sophos security system, but I do not think that this is the case.

For me even do not work "show my windows and tabs from last time" option. Every time I start Firefox I have got only start page but no previous session..

for now I am degrading to 19.02

If it helps at all... We are also using Roaming Profiles on a Windows 2008R2 server environment. Any of you others using roaming profiles?

Yes I think so, I have .appdate localized on a server and few other folders too. this could be a problem?

I think there is a way to exclude the appdata from active directory in gpedit.msc but i am really not good in it to do it, i have tried but i think i can't. But maybe it will help? but why there is no problem with previous versions of firefox?

If I log on as a local user account on the machine, the problem is gone and all works as it should! If I log back on with my server account, it's broken again.

So basically yes, I've confirmed it IS related to roaming profiles (at least in my case).

Fix please?

There is a possibility to change firefox cache/profile etc folders from roaming folders to normal ones? Or should we wait till some fix from mozilla?

Fairly certain it's all or nothing with the appdata folder redirection and such. I tried submitting a "feedback" for them and it errored on me too... and you can't submit one unless you are using FF! Grr...

I hope someone from Mozilla sees this thread that can actually fix it.

https://bugzilla.mozilla.org/show_bug.cgi?id=857711

This seems like it likely the case that the new version changed where or how folders are stored.

We do not use roaming profiles but have redirected user folders on AD login users and all devices with this setup have the same issues. Laptops with local logins work fine.

That could be it too... the folder redirection. We do that as well. They are starting to track it here now: https://bugzilla.mozilla.org/show_bug.cgi?id=857672

Same unresponsive address and search bar on my network of 650+ PCs. We have redirected profiles and can confirm this issue does not affect local (non-roaming, non-domain) accounts. FF v19 worked fine but with auto-updates turned on this has become a mess.

Safe mode, disable extensions, etc. - no change. Need resolution ASAP on this because it is a show stopping issue for FF.

For anyone experiencing this issue, please feel free to switch to Firefox ESR until we release a fix for Firefox 20. http://www.mozilla.org/en-US/firefox/organizations/ This will leave your secure and protected from the security holes fixed in Firefox 20, and is a better solution than downgrading to Firefox 19.

I will leave this thread open but please see and follow

• Hi, we are in the company users use mobile profiles. After updating firefox to version 20 when you enter the address in the browser and press Enter, nothing ha /questions/955232