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Installed Firefox on Mac (OS 10.5.8) Will not open a browser window even after rebooting. Also - Must "Force Quit" to exit Firefox

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I installed Firefox on my Mac today (Mac OS 10.5.8) However File>New does not open browser window. Nothing happens. I rebooted and launced Firefox again but this did not help. I had been using Safari. Firefox is clearly running and I must do a "Force Quit" to quit Firefox.

This happened

Every time Firefox opened

I installed Firefox on my Mac today.

User Agent

Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10_5_8; en-us) AppleWebKit/533.17.8 (KHTML, like Gecko) Version/5.0.1 Safari/533.17.8

Alle Antworten (2)

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Hello John.

Hopefully this support article is what you need:


Also, you may be interested in this one:


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Ok, I have the answer dear Mac friends.

Go to your finder window - then at the bottom - include system files.

Search for firefox - delete everything - reinstall. Problem solved.