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Mozilla Firefox is a free and open-source web browser developed by the Mozilla Foundation. It uses the Gecko layout engine originally developed by Netscape.

2 votes
Accepted

Tor Browser Bundle Showing Error "Firefox is Already Running" on Mac

This looks like a bogus error message. At least in my case, it was caused by a file ownership problem. To diagnose, I made a copy of TorBrowser.app, and was surprised when the copy ran successfully. R …
John G's user avatar
  • 66
3 votes

Tor upgrade says a copy of firefox is already running macbook NOT WINDOWS

This looks like a duplicate of Tor Browser Bundle Showing Error "Firefox is Already Running" on Mac. … (In short, if you haven't actually started Firefox elsewhere, the problem probably is not that Firefox is already running.) …
John G's user avatar
  • 66