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FF will not open, not uninstall (Msg: firefox must be closed...) does not do anything.

  • 3 replies
  • 19 have this problem
  • Last reply by Ghiyath

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Added an ad-on yesterday - about 3d picture(?). Now FF does not open at all, tried to uninstall but it will not uninstall - it gives the msg. "FF must be closed." -- but it is closed, will not open, will not do anything.

This happened

Every time Firefox opened

Not quite sure, tried to download a photo ad-on

User Agent

Opera/9.80 (Windows NT 5.1; U; en) Presto/2.5.24 Version/10.53

All Replies (3)

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This is my own message. To explain it again:

1. FF will not open at all. 2. Cannot uninstall FF. 3. Cannot download new version to replace FF. 4. It may be causing other problems outside FF.


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FF very slow to open - so trying to re-install - but when I try to uninstall it says FF is open but it does not appear to be.

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I had the same problem...5 min ago...then i solved the problem.. Try enabling Mozilla default skin : Tools>Add-Ons>Appearance> Enable Default .