hello, can you try to replicate this behaviour when you launch firefox in safe mode once? if not, maybe an addon is interfering here...

Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems

Does this also happen if you try to open the about:preferences page directly via the location/address bar?

If you do not find any settings- or add-on-related reason for the problem, try this:

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, corrupted, or alien code files). As described below, this process does not disturb your existing settings. Do NOT uninstall Firefox, that's not needed.

(1) Download a fresh installer for Firefox 39.0 from https://www.mozilla.org/firefox/all/ to a convenient location. (Scroll down to your preferred language.)

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

(3) Rename the program folder, either:

(64-bit Windows folder names)

C:\Program Files (x86)\Mozilla Firefox

to

C:\Program Files (x86)\OldFirefox

(32-bit Windows folder names)

C:\Program Files\Mozilla Firefox

to

C:\Program Files\OldFirefox

(4) Run the installer you downloaded in #1. It should automatically connect to your existing settings.

Any improvement after this reinstall?

Note: Some plugins may exist only in that OldFirefox folder. If something essential is missing, look in these folders:

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

cor-el said

Does this also happen if you try to open the about:preferences page directly via the location/address bar?

Yes, it still happens.

Did starting Firefox in Safe Mode help?

If that is the case, were you able to identify the extension that is causing this?

Safe mode did not help. I've tried all I'm capable of doing and nothing works. Regardless of what I do, Options will not work. Still says there is a problem loading page.

It worked fine several days ago. Now it doesn't.

bkelly007 said

I've tried all I'm capable of doing and nothing works.

Does that include the clean reinstall? https://support.mozilla.org/questions/1074408#answer-759624

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I am not very computer savvy so some of the recommended things are not feasible for me to do because I'm afraid to try anything like that. The Option feature is still not working. I lost everything on my computer recently because of a tech that didn't know what he was doing, so you can see my reluctance to try something I'm not familiar with. I had to reinstall Firefox as my browser as well as add all my favorites and reinstall a few programs, such as Office and Norton. That's all.

bkelly007 said

I lost everything on my computer recently because of a tech that didn't know what he was doing . . . .

Was the system fixed after this?

Perform a System File Check to fix corrupted system files Win 7, 8, Vista: https://support.microsoft.com/en-us/kb/929833

See if there are updates for your graphics drivers https://support.mozilla.org/kb/upgrade-graphics-drivers-use-hardware-acceleration

• 1 Download Firefox Full Installer For All languages And Systemsv39 {web link}
• 2 Uninstall Firefox from your computer {web link}
  DO NOT remove your profiles.
• 3 After, reboot the computer. Then run the full installer.

Problem is solved. I just uninstalled Firefox and reinstalled it and everything is working fine.

Hello,

I am glad to hear that your problem has been resolved. If you haven't already, please select the answer that solves the problem. This will help other users with similar problems find the solution more easily.

Thank you for contacting Mozilla Support.