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When i click customize and hit the circle on the lower right of the customize area, the page goes black, and or closes!

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I noticed this a couple of days ago but didn't think anything more about it as my password and user name wouldn't ever list in my e-mail area for getting a new 1 so I didn't worry too much about it! Now trying to go through and figure why Facebook games didn't upload, it is important! Clicking that round circle next to Customize and my page closes down, and sometimes goes black then closes down!

I noticed this a couple of days ago but didn't think anything more about it as my password and user name wouldn't ever list in my e-mail area for getting a new 1 so I didn't worry too much about it! Now trying to go through and figure why Facebook games didn't upload, it is important! Clicking that round circle next to Customize and my page closes down, and sometimes goes black then closes down!

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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.

You can also 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: