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I know that there are extensive, "proper" methods for installing Firefox plugins. However, I would like to know where the folder is for linking shared-object (.so) files, such as libnpjp2.so and libflashplayer.so so that I can install plugins the "old-fashioned" way. In Firefox 21, I would have put it in ~/.mozilla/firefox/*[profile name].default/browser/plugins but that folder is no longer there. It keeps jumping around as Firefox changes. In about:plugins I still see all the plugins that I would have put there.

Can anyone tell me where the folder is? I already checked the folders in /usr/lib/firefox and /usr/lib/mozilla.

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3 Answers 3

up vote 4 down vote accepted

Acording to the Firefox developer documentation plugins live here:

  • Directory pointed to by MOZ_PLUGIN_PATH environment variable
  • ~/.mozilla/plugins
  • /usr/lib/mozilla/plugins (on 64-bit systems, /usr/lib64/mozilla/plugins is used instead)
  • Plug-ins within toolkit bundles
  • [Profile directory]/plugins, where [Profile directory] is a user profile directory

I can reproduce the above on my system.

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I am on KDE 32bit 14.04 version. Firefox is already installed.

user Richard got negative reputation by telling us the correct path:

/usr/lib/firefox-addons/plugins

If you are proper linux user, it's no problem to move libflashplayer.so file to this directory as root user!

Youtube works after dat!

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Users should place plugins in /usr/lib/firefox-addons/plugins as root.

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1  
Users should do nothing as root. –  mniess Nov 29 '13 at 23:02
    
This is only in the case you want a certain plugin to be automatically installed in all new user profiles. As a single user, you shouldn't install anything at all in this directory. –  darent Nov 29 '13 at 23:18

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