Unregister Adobe reader from Firefox after uninstalling
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Maybe you've got a different version of firefox - I'm using 184.108.40.206 and Preferences doesn't seem to have anything about applications. The top-level tabs are Main, Tabs, Content, Feeds, Privacy, Security, and Advanced, but none of them have an Applications button or tab. The closest is Content -> Manage File Types, but that brings up a window with an empty list with no way to add to it.
Problematic browser preferences
Instead of opening a file via the associated plugin, the Firefox "Opening" dialog box may appear, asking you to choose between saving the file or opening it in an external application, even though the file is being sent with the appropriate MIME type and you have a plugin enabled for that type, as shown in about:plugins. If attempting to change the action is unsuccessful, this problem can be fixed by resetting certain plugin-related preferences, as follows :
1. Type about:config into the address bar.
2. Find the preference browser.download.pluginOverrideTypes and, if it is present, right-click on it and select reset.
3. Find the preference plugin.disable_full_page_plugin_for_types and, if it is present, right-click on it and select reset.
If you do the above and the problem persists, or if you want to remove all previously-set Download Actions and restore the default actions, close the browser, open the profile folder and delete (or rename) the file mimeTypes.rdf. Caution: There is also a mimeTypes.rdf file in the program folder. Do not delete it by mistake.