How to remove second menu bar on mac Firefox?
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Can you attach a screenshot?
Use a compressed image type like PNG or JPG to save the screenshot.
Try to remove the Firefox plist file (org.mozilla.firefox.plist).
Go to "~/Library/Preferences" and remove the plist file for Firefox (org.mozilla.firefox.plist)
Try to repair the disk permissions:
You can also check for problems with the localstore.rdf file.