Take the 2-minute tour ×
Ask Ubuntu is a question and answer site for Ubuntu users and developers. It's 100% free.

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.

share|improve this question

3 Answers 3

up vote 17 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 non-Ubuntu 64-bit systems, /usr/lib64/mozilla/plugins might be 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.

share|improve this answer
Mine is 64-bit system but i found out that it is at /usr/lib/mozilla/plugins. Also it is a good idea to have a look at about:plugins tab that may give a hint. –  Fredrick Gauss Jun 10 at 5:49
Fredrick Gauss's comment holds good for 14.04 too. –  learner Aug 9 at 3:38
@learner, thanks. The info is directly from the Firefox documentation. Ubuntu puts 64bit libs in /usr/lib and 32bit libs in /usr/lib32 instead of having a lib64 directory. So I changed the answer a little to reflect that. –  mniess Aug 11 at 13:31

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

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


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!

share|improve this answer

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

share|improve this answer
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
@darent Where should we install the plugin then? –  iamcreasy Dec 22 '14 at 10:15
@iamcreasy see the answer by user mnies –  Richard Dec 22 '14 at 10:51

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.