Firefox offers a number of customization options and add-ons that allow users to tweak the browser to meet their specific needs. Unfortunately, however, this may sometimes result in random slowdowns and crashes that require a reset of the internet browser.
This procedure will restore the web browser to its default settings, removing any and all previously-set customization options or add-ons. This will not affect your personal data.
How To Reset Firefox Settings
Open Firefox and type
into the address bar. Press Enter.
In the page that opens, navigate to Give Firefox a tune up and click on Refresh Firefox:
A warning message will be displayed. Click on Refresh Firefox to proceed:
Firefox will restart. Once it begins running again, it will automatically restore your browsing data, saved passwords, bookmarks, windows, and tabs: