Entries in '''''about:config''''' that are left behind after uninstalling '''''Extensions''''', can be cleared by right-clicking those items and choosing "Reset" which should make the "Value" column blank. Restart Firefox and those entries should be gone. Uninstalling an '''''Extension''''' is not a "clean" process, just as uninstalling applications from your computer system usually leaves behind some Registry entries and files/folders on your hard drive. *See --> http://kb.mozillazine.org/About:config Plugins are installed by separate applications installed on your system, like Adobe Reader (Adobe PDF Plug-In For Firefox and Netscape), Adobe Flashplayer (Shockwave Flash), RealPlayer, Java, etc. The Plugins are installed through the Window Registry for Windows systems. You can see the applications in Control Panel > Add or Remove Programs (or Programs and Features). The Plugins will install in your browsers unless you uninstall those applications. *See --> https://en.wikipedia.org/wiki/Plug-in_%28computing%29 *Also see (Extensions) --> https://en.wikipedia.org/wiki/Browser_extension *Also see (Add-ons) --> https://en.wikipedia.org/wiki/Add-on_%28disambiguation%29 (''a general term that includes Extensions, Plug-ins, Themes, etc.) '''If this reply solves your problem, please click "Solved It" next to this reply when <u>signed-in</u> to the forum.''' ------------------------- Not related to your question, but... You may need to update some plug-ins. Check your plug-ins and update as necessary: *Plug-in check --> http://www.mozilla.org/en-US/plugincheck/ *Adobe Shockwave for Director Netscape plug-in: [https://support.mozilla.org/en-US/kb/Using%20the%20Shockwave%20plugin%20with%20Firefox#w_installing-shockwave Installing ('''''or Updating''''') the Shockwave plugin with Firefox] *Adobe PDF Plug-In For Firefox and Netscape: [https://support.mozilla.org/en-US/kb/Using%20the%20Adobe%20Reader%20plugin%20with%20Firefox#w_installing-and-updating-adobe-reader Installing/Updating Adobe Reader in Firefox] *Shockwave Flash (Adobe Flash or Flash): [https://support.mozilla.org/en-US/kb/Managing%20the%20Flash%20plugin#w_updating-flash Updating Flash in Firefox] *'''''Next Generation Java Plug-in for Mozilla browsers''''': [https://support.mozilla.org/en-US/kb/Using%20the%20Java%20plugin%20with%20Firefox#w_installing-or-updating-java Installing or Updating Java in Firefox]

If you set this pref - '''plugin.expose_full_path''' - to true in about:config, you'll see in the about:plugins tab where those plugins are actually sitting on your hard drive. They are not in any Firefox folders, that was banned by Mozilla back in Firefox 3.6 for newly installed programs that contain Firefox plugins; as of like Firefox 5 that old plugins folder that used to be in the Firefox program files doesn't even exist any longer ''(although users can create that folder and drop plugin files in there themselves)''.

Thanks folks. So basically, Firefox is just deferring to the Windows registry for a list of installed plugins. That's ok, but I think it should still prompt for them when it sees one (not just on fresh install), just like addons. The user's choice is paramount, not the registry.