How to fix "Firefox is already running but is not responding" error message -

In this guide, we'll show you a few different methods for fixing the Firefox is already running but is not responding error message on a Linux system.

First, let's go over a few reasons for why this error may be occurring. It's not uncommon to have an application freeze or "hang" every once in a while, so if this isn't an issue that you repeatedly have with Firefox, you can probably simply kill the process and get back to what you were doing.

This is a companion discussion topic for the original entry at