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The options menu doesnt work

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  • 1 has this problem
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  • Last reply by FredMcD

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I click it and it says about:preferences in the address bar, but where the page is supposed to be it says "This address isn't valid." I looked at some other threads and its not my theme (I use the default one) and I tried restarting with add ons disabled and I tried restoring defaults. In the past when this happened I toggled browser.preferences.inContent to false as per https://support.mozilla.org/en-US/questions/1066090 but now browser.preferences.inContent isn't a thing on the about:config page.

I click it and it says about:preferences in the address bar, but where the page is supposed to be it says "This address isn't valid." I looked at some other threads and its not my theme (I use the default one) and I tried restarting with add ons disabled and I tried restoring defaults. In the past when this happened I toggled browser.preferences.inContent to false as per https://support.mozilla.org/en-US/questions/1066090 but now browser.preferences.inContent isn't a thing on the about:config page.

Chosen solution

Start Firefox in Safe Mode to check if one of the extensions (3-bar Menu button/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem.

  • Switch to the DEFAULT theme: 3-bar Menu button/Tools > Add-ons > Appearance
  • Do NOT click the Reset button on the Safe Mode start window

Do a clean reinstall and delete the Firefox program folder before (re)installing a fresh copy of the current Firefox release.

If possible uninstall your current Firefox version to cleanup the Windows registry and settings in security software.

  • Do NOT remove "personal data" when you uninstall your current Firefox version, because this will remove all profile folders and you lose personal data like bookmarks and passwords including data in profiles created by 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\"

Your personal data like bookmarks is stored in the Firefox profile folder, so you won't lose personal data when you uninstall and (re)install or update Firefox, but make sure NOT to remove personal data when you uninstall Firefox as that will remove all Firefox profile folders and you lose your personal data.


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All Replies (2)

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Chosen Solution

Start Firefox in Safe Mode to check if one of the extensions (3-bar Menu button/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem.

  • Switch to the DEFAULT theme: 3-bar Menu button/Tools > Add-ons > Appearance
  • Do NOT click the Reset button on the Safe Mode start window

Do a clean reinstall and delete the Firefox program folder before (re)installing a fresh copy of the current Firefox release.

If possible uninstall your current Firefox version to cleanup the Windows registry and settings in security software.

  • Do NOT remove "personal data" when you uninstall your current Firefox version, because this will remove all profile folders and you lose personal data like bookmarks and passwords including data in profiles created by 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\"

Your personal data like bookmarks is stored in the Firefox profile folder, so you won't lose personal data when you uninstall and (re)install or update Firefox, but make sure NOT to remove personal data when you uninstall Firefox as that will remove all Firefox profile folders and you lose your personal data.


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If the above does not help,


Separate Issue; Your System Details shows;

Installed Plug-ins

LabVIEW 2012 Netscape Plug-in for Win32 LabVIEW 2013 Netscape Plug-in for Win32 LabVIEW 2014 Netscape Plug-in for Win32
Having more than one version of a program may cause issues. You must remove the older programs. Then get the current full installer.