This article describes some causes of a long start up time and steps you can take to improve it.
- If Firefox starts but isn't responsive, see Firefox hangs or is not responding - How to fix.
- If Firefox does not start up at all, see Firefox won't start - find solutions.
Table of Contents
Change the home page
Problems with a website can cause Firefox to take a long time to start. Try changing your Firefox home page to the default home page or a blank page. See How to set the home page for instructions.
Change how windows and tabs are loaded
If you set Firefox to use the Session Restore feature to show your windows and tabs from last time, Firefox can take a long time to start if you had lots of websites open the last time you used Firefox. You can choose to only load the last selected of the open tabs:
- In the Menu bar at the top of the screen, click and select .Click the menu button and select ...
- Select the General panel
- Check Don't load tabs until selected so that only the last selected tab is loaded at startup (this should be the default setting).
Check your antivirus software
Firefox reads a number of files normally during startup. Some antivirus software may do intensive scans of each of these files during startup and block access until those scans complete. If the problem began after installing, updating, or reconfiguring your antivirus software, contact the software provider for assistance.
Troubleshoot extensions or themes
Firefox loads extensions when it starts up and many extensions add startup tasks. See Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems for steps on how to identify an extension that may be causing the problem.
Speed up Windows and make your computer work better. See Speed up your computer at microsoft.com. See Speed up your computer and Optimize Windows 7 for better performance at microsoft.com.See Tips to improve PC performance in Windows 10 at microsoft.com.
If the previous suggestions don't significantly reduce Firefox startup time, see Troubleshoot and diagnose Firefox problems for other steps you can take to resolve the problem.