mozilla firefox not responding on startup

Now try to open Firefox again and it’ll start a new Firefox window without any error message. You can also click on “ End task” button given at the bottom in Task Manager window. Right-click on Firefox.exe process and select End task or End process tree option. Press Ctrl+Shift+Esc keys together to open Task Manager.ģ. Following steps will help you in terminating Firefox process:ġ. If your OS doesn’t kill Firefox process, you’ll need to manually kill existing Firefox process. Once the already running Firefox process is terminated, a new window of Firefox will launch without any error message. So wait for some time and Windows or other operating system such as Linux, Mac may automatically kill existing running Firefox process. As they always say “ Patience is a virtue“. If clicking on “Close Firefox” button doesn’t work, then have some patience. It’ll open a fresh window of Firefox without any error message. Click on “Close Firefox” button and it should kill the already running Firefox process and should also start a new Firefox process. The error message dialog box contains 2 buttons: Close Firefox and Cancel.

So when you try to launch Firefox, it detects that an existing process is already running in background and throws the above mentioned error message.įollowing are some solutions which you can follow if you get “Firefox is already running, but is not responding” error message while opening Firefox web browser: 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.

Mozilla firefox not responding on startup