Software installers can add plugins and extensions to Firefox by adding them to the Windows registry, or by dropping them into shared folders. So you might get detections in unexpected places on the hard drive. ---- Generally speaking, I suggest the following process for cleaning up unwanted software: Open the Windows '''Control Panel''', Uninstall a Program. Click the "Installed on" column heading to group the infections, I mean, additions, by date. This can help in smoking out undisclosed bundle items that snuck in with some software you agreed to install. Take out as much trash as possible here. Then, in Firefox, open the '''Add-ons page''' using either: * Ctrl+Shift+a * "3-bar" menu button (or Tools menu) > Add-ons In the left column, click Plugins. Set nonessential and unrecognized plugins to "Never Activate". In the left column, click Extensions. Then, if in doubt, disable (or Remove, if possible) unrecognized and unwanted extensions. Often a link will appear above at least one disabled extension to restart Firefox. You can complete your work on the tab and click one of the links as the last step. Finally, you can "mop up" remaining issues with the '''scanning/cleaning tools''' listed in our support article: [[Troubleshoot Firefox issues caused by malware]]. ---- In about:config: * You can ignore the old advice about keyword.URL. That is obsolete because the address bar now uses the same search engine you select in the separate search bar. * Bold items are new or have been changed from their factory defaults. Some of them are bolded when you modify settings in Firefox dialogs, some are added by add-ons (for example, extensions.wrc appears to relate to the avast! extension), and some are computed by Firefox, such as the last time it checked for updates.