When trying to open Firefox I get this message--A copy of Firefox is already open. Only one copy of Firefox can be open at a time.

Pred 13 rokmi

30. 11. 2011 3:09

Newly installed on new computer.

Answer 1 · 2011-11-30 03:09:51

30. 11. 2011 3:26

Firefox sometimes after quitting will remain in memory, however seem to be closed.

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Answer 2 · 2011-11-30 03:09:51

30. 11. 2011 12:35

Create a new profile as a test to check if your current profile is causing the problems.

See "Basic Troubleshooting: Make a new profile":

If that new profile works then you can transfer some files from the old profile to that new profile, but be careful not to copy corrupted files.

See: