Sometimes Firefox requires restart to install and apply new updates, in such case this error message also appears.Īctually this error message appears if Firefox process firefox.exe is still running in background and was not terminated/killed by operating system automatically. Many times Firefox becomes very slow or I face problems while adding/removing bookmarks, in such case I restart Firefox by closing and re-opening it and I get this error message at startup. I receive the above mentioned error message frequently whenever I close Firefox and re-open it. To open a new window, you must first close the existing Firefox process, or restart your system. Firefox is already running, but is not responding.
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