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On F56, customize menus just don't work, either blank or don't appear at all
I'm using Firefox 56 and getting NO response to any of the "Customize" menu options on any of the toolbars
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In what way? Can't open the customize page? Can't move the icons? Movements are not saved?
Could you please expand on the issues as to what you are trying to do in Customize and also how it is not working for you please.
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You can check for problems with preferences.
Delete possible user.js and numbered prefs-##.js files and rename/remove 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 current Firefox releases.
Start Firefox in Safe Mode to check if one of the extensions ("3-bar" menu button or Tools -> Add-ons -> Extensions) or if hardware acceleration is causing the problem.
- switch to the DEFAULT theme: "3-bar" menu button or Tools -> Add-ons -> Appearance
- do NOT click the "Refresh Firefox" button on the Safe Mode start window