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I can't use Options. When i select it, I get: The address isn't valid The URL is not valid and cannot be loaded

more options

This is the address that shows in the address bar: about:preferences

This is the address that shows in the address bar: about:preferences

Chosen solution

Did this start after the last update? Your Firefox program files might have gotten damaged. To fix that, I suggest:

Clean Reinstall

We use this name, but it's not about removing your settings, it's about making sure the program files are clean (no inconsistent or alien code files). As described below, this process does not disturb your existing settings. Do NOT uninstall Firefox, that's not needed.

(A) Download a fresh installer for Firefox 45.0 from https://www.mozilla.org/firefox/all/ to a convenient location. (Scroll down to your preferred language.) For maximum plugin compatibility (and always on XP), choose the 32-bit version.

(B) Exit out of Firefox (if applicable).

(C) Rename the program folder as follows:

(32-bit Firefox on 64-bit Windows)

C:\Program Files (x86)\Mozilla Firefox

to

C:\Program Files (x86)\OldFirefox

(Other systems)

C:\Program Files\Mozilla Firefox

to

C:\Program Files\OldFirefox

(D) Run the installer you downloaded in step (A). It should automatically connect to your existing settings.

Can you get to the Options page?

Note: Some plugins may exist only in that OldFirefox folder. If something essential is missing, look in these folders, but to avoid introducing problems, please don't just copy everything over:

  • \OldFirefox\Plugins
  • \OldFirefox\browser\plugins
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more options

Chosen Solution

Did this start after the last update? Your Firefox program files might have gotten damaged. To fix that, I suggest:

Clean Reinstall

We use this name, but it's not about removing your settings, it's about making sure the program files are clean (no inconsistent or alien code files). As described below, this process does not disturb your existing settings. Do NOT uninstall Firefox, that's not needed.

(A) Download a fresh installer for Firefox 45.0 from https://www.mozilla.org/firefox/all/ to a convenient location. (Scroll down to your preferred language.) For maximum plugin compatibility (and always on XP), choose the 32-bit version.

(B) Exit out of Firefox (if applicable).

(C) Rename the program folder as follows:

(32-bit Firefox on 64-bit Windows)

C:\Program Files (x86)\Mozilla Firefox

to

C:\Program Files (x86)\OldFirefox

(Other systems)

C:\Program Files\Mozilla Firefox

to

C:\Program Files\OldFirefox

(D) Run the installer you downloaded in step (A). It should automatically connect to your existing settings.

Can you get to the Options page?

Note: Some plugins may exist only in that OldFirefox folder. If something essential is missing, look in these folders, but to avoid introducing problems, please don't just copy everything over:

  • \OldFirefox\Plugins
  • \OldFirefox\browser\plugins