Review: Reset Firefox Has Landed

" ...Firefox users will soon be able to make use of the new Reset Firefox feature. While it is not solution that fixes all issues that users may experience, it is one that will fix a good chunk of issues that Firefox users may encounter...
"Firefox users who try to resolve issues with the browser by reinstalling it will see the biggest benefits, as reinstallations previously did not change the user profile folder at all, which often meant that the issues persisted after the new installation.... "

Source: ghacks
More  Reset Firefox Has Landed, And It’s Awesome


Go get it.