Firefox can find plugins in various places. One of them is the plugins folder in the Firefox installation folder. * http://kb.mozillazine.org/Determining_plugin_directory_on_Linux You have other plugins installed, so you can see the path of them on the about:plugins page if you first set the pref <b>plugin.expose_full_path</b> on the about:config page.<br /> It is best not to leave that pref set to true as it exposes that full path to web servers, so reset that pref to false after you are done with the about:plugins page. You can open about:plugins and about:config via the location bar, like you open a website (about: is a special protocol to access some build-in pages).<br /> If you get a warning when opening the about:config page then you can confirm that you want to continue. See "Manually uninstalling a plugin" in [[Troubleshooting plugins]] See also http://kb.mozillazine.org/Issues_related_to_plugins#Identifying_installed_plugins