When you installed Firefox did you do a custom installation and select development tools? If you can't remember try reinstalling over your existing Firefox installation. It will retain all of your settings so you don't need to worry about losing your bookmarks, extensions, themes, etc.
When you installed Firefox did you do a custom installation and select development tools? If you can't remember try reinstalling over your existing Firefox installation. It will retain all of your settings so you don't need to worry about losing your bookmarks, extensions, themes, etc.