Firefox Won’t Start: Troubleshooting Guide

If Firefox won’t start, there can be several reasons for this, but most can usually be resolved quickly. We’ll give you some useful tips and solutions.

Firefox won’t start: Quickly fix the problem

• If Firefox won’t start, this can usually be fixed: Open the Task Manager with [Ctrl] + [Shift] + [Esc] and end all processes named “Firefox”.
• Then restart Firefox as usual. If necessary, you may also need to right-click the program and select “Run as administrator”.
• If you still cannot start Firefox, the quickest solution is a clean reinstallation. You can save your bookmarks so they are available again in the “new” Firefox.
• If Firefox still doesn’t work after a fresh installation, you can temporarily disable your firewall or antivirus software to prevent Firefox from being blocked there.