Update Firefox: Make sure you are running the latest version of Firefox by going to the Firefox menu and selecting Help > About Firefox. If there is an update available, install it and restart Firefox to see if the issue is resolved. Disable extensions: Third-party extensions or add-ons can sometimes interfere with Firefox and cause it to use a lot of system resources, which can slow down your computer. Try disabling your extensions one by one and checking if the issue is still present. You can do this by going to the Add-ons Manager in Firefox and selecting the Extensions panel. Clear cache and cookies: Clearing the cache and cookies can help fix issues with website data that may be causing Firefox to slow down your computer. To do this, go to the History menu in Firefox, select Clear Recent History, and choose the cache and cookies options. Then, click on Clear Now to clear the data.