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Now the menu drop down has lost the customize function

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That's right. The drop down menu has started screwing up. It's no longer able to take me to customize. I'm unable to make any changes anywhere. A tab for customize will appear, but it will not populate and will not give me any control.

Over the past few months, I've become frustrated with how FF functions. Or doesn't.

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Try to reset the browser.uiCustomization.state pref on the about:config page.

You can open the about:config page via the location/address bar. You can accept the warning and click "I'll be careful" to continue.

Try to rename (or delete) the xulstore.json file in the Firefox profile folder. You can use this button to go to the currently used Firefox profile folder:

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

You can check for problems with preferences.

Delete possible user.js and numbered prefs-##.js files and rename (or delete) the prefs.js file to reset all prefs to the default value including prefs set via user.js and prefs that are no longer supported in the current Firefox release.