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I installed acroread from the repositories, and it has decided it should be the default plugin in Firefox, such that when I click on a pdf, it opens in a Firefox window. Unfortunately, it does not display (at least when in dual head mode).

This should be simple, but I cannot disable the plugin. Under Firefox Edit -> Preferences-> Applications -> pdf is set to "always ask" so I don't know why it uses acroread in the first place. Under Tools -> Manage Content Plugins I see acroread is selected for pdf content. I have the option in the dropdown to search for a new plugin, but not to simply download the file.

Typing about:config into the Firefox toolbar gives me a list of configuration options, but does not mention plugin.disable or acroread anywhere.

How do I disable the plugin? I have Firefox 11.0 on Ubuntu 11.10

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up vote 1 down vote accepted

I you want to get rid of the plugin permanently, because it is not removed by apt if you remove acroread, you have to delete it manually:

sudo rm /usr/lib/mozilla/plugins/

That worked for me on Ubuntu 13.04

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You go to extensions, and there you can disable: enter image description here

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If this is now what you are searching for, I will delete the answer. – gajdipajti Apr 4 '12 at 22:30
That's it, thanks! Sounds like the behaviour I described is a known bug, and toggling the Application preferences to acroread and then back to always ask would work too. See the comments in this question – cboettig Apr 5 '12 at 16:41
this issue is not resolved, as the plugin only seems to be disabled, but effectively is not and the entry will re-appear: cf with this unresolved bug for instance... – nutty about natty Mar 5 '13 at 7:36

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