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I have lost my browser window

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After upgrading to 2.4, I lost my browser window. My computer is a Mac Book. An alternate browser has a browser window, but not Firefox, which is my preferred browser to use when teaching online.

After upgrading to 2.4, I lost my browser window. My computer is a Mac Book. An alternate browser has a browser window, but not Firefox, which is my preferred browser to use when teaching online.

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Do you mean that you only get the Firefox menu bar?

You can check for problems caused by a corrupted localstore.rdf file.

You can also try these:

Remove the Firefox plist file (org.mozilla.firefox.plist).

Go to "~/Library/Preferences" and remove the plist file for Firefox (org.mozilla.firefox.plist)

Repair the disk permissions: