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Also, how do I force Firefox to shut down?

2 Answers

1. Start with Command - Option - Escape to bring up the Force Quit dialog and see if it's there. If it is, force quit it (sounds like you've already tried this).
2. Open Terminal, and run ps -eaf | grep Firefox .

Beside above, why is my Mozilla Firefox not working? Failed to read the configuration file. This error is caused by a problem with Firefox program files. The solution is to remove the Firefox program and then reinstall Firefox. (This will not remove your passwords, bookmarks or other user data and settings which are stored in a separate profiles folder.)

In this regard, why can't I close Firefox?

Hello, press Ctrl + Alt + Delete on your keyboard and click on Start Task Manager, then force kill firefox.exe -- when reopening Firefox it will ask you if you want to Restore your Previous Session, or Start New Session. Click on Start New Session. If this solved your problem, mark as solution.

How do I kill a non responding program on a Mac?

Force Quit with Mac Shortcut To do the same thing but faster, use Mac shortcut keys to close frozen applications. On your keyboard, press and hold Command + Option + Esc. It will immediately bring up a “Force Quit Application” window. Select the frozen application from the dialogue box and select “Force Quit.”