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Linux, Firefox 21.0 and the latest flash FOR LINUX (11.2). I can't view youtube videos because firefox has disabled the plugin. Help!

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New User

Linux, Firefox 21.0 and the latest flash FOR LINUX (11.2). I can't view youtube videos because firefox has disabled the plugin. Help!

One hour ago I was happily watching youtube videos under Linux using Firefox 20.0 and flash 11.2. I just updated firefox and it is now blocking my flash and prompting me to update. The problem is I can't update because 11.2 is the LAST flash plugin for firefox, there won't be any other version.

Is there a way to prevent firefox from disabling my plugin?

1 ACCEPTED SOLUTION

Accepted Solutions
New User

Re: Linux, Firefox 21.0 and the latest flash FOR LINUX (11.2). I can't view youtube videos because firefox has disabled the plugin. Help!

The directory structure, at least for linux, seems to have changed for version 21. I have my firefox distribution in /opt/firefox/, and up to now I've keep the flash plugin in /opt/firefox/plugins/. With vers 21, the plugin directory should be /opt/firefox/browser/plugins/ This directory doesn't exist by default. You can create it or just mv the old plugin directory to the new location

$ cd /opt/firefox/ #(or wherever your firefox is installed) $ mv plugins/ browser/

The icons/ directory has also been moved into this sub-directory, which is why my firefox desktop button was not displayed correctly after the update.


Really - the main thing that firefox should be doing is to archive the previous version of firefox whenever it does an update. It is ridiculous to have to deal with this sort of issue immediately after an update when you might have important work to get done in a timely manner!! There needs to be a simple option to temporarily revert to the previous version of firefox. This would be trivial to implement, and could be used when a new version breaks something.

15 REPLIES
Mozilla Support Contributor

Re: Linux, Firefox 21.0 and the latest flash FOR LINUX (11.2). I can't view youtube videos because firefox has disabled the plugin. Help!

Will Firefox let you re-enable Flash here:

Tools menu > Add-ons > Plugins category

When I look at this morning's blocklist.xml for libflashplayer.so (on a Windows 7 system with Firefox 21 beta), I'll admit I don't read regular expressions well enough to know for sure whether Flash 11.2 is targeted here, but I don't think so. Your blocklist.xml may vary:

<pluginItem  blockID="p330">
  <match name="description" exp="^Shockwave Flash (([1-9]\.[0-9]+)|(10\.([0-2]|(3 r(([0-9][0-9]?)|1(([0-7][0-9])|8[0-2]))))))( |$)" />
  <match name="filename" exp="libflashplayer\.so" />
  <versionRange  severity="0" vulnerabilitystatus="1">
    <targetApplication  id="{ec8030f7-c20a-464f-9b0e-13a3a9e97384}">
      <versionRange  minVersion="19.0a1" maxVersion="*" />
    </targetApplication>
  </versionRange>
</pluginItem>
<pluginItem  blockID="p332">
  <match name="description" exp="^Shockwave Flash 11.(0|1) r[0-9]{1,3}$" />
  <match name="filename" exp="libflashplayer\.so" />
  <versionRange  severity="0" vulnerabilitystatus="1">
    <targetApplication  id="{ec8030f7-c20a-464f-9b0e-13a3a9e97384}">
      <versionRange  minVersion="19.0a1" maxVersion="*" />
    </targetApplication>
  </versionRange>
</pluginItem>
Site Moderator

Re: Linux, Firefox 21.0 and the latest flash FOR LINUX (11.2). I can't view youtube videos because firefox has disabled the plugin. Help!

I'm not aware of any blocking of 11.2 Flash Player plugin versions.

Blocked 10.3 versions should be possible to enable via click-to-play.

Did you already update to the latest 11.2.202.285 version?

New User

Re: Linux, Firefox 21.0 and the latest flash FOR LINUX (11.2). I can't view youtube videos because firefox has disabled the plugin. Help!

Thanks for your quick reply.

More information:

If the flash plugin is placed in "/usr/lib/mozilla/plugins", flash runs and the annoying message goes away. Also, I can see the plugin in about:plugins and in tools>add-ons>plugins.

If the flash plugin is in "/usr/local/firefox/plugins" (which is where I placed my custom firefox installation) I can't see it neither in about:plugins nor in tools>add-ons>plug-ins

Did the latest firefox change the directory where it looks for plugins?

Is there a way of preventing firefox from disabling outdated plugins?

Site Moderator

Re: Linux, Firefox 21.0 and the latest flash FOR LINUX (11.2). I can't view youtube videos because firefox has disabled the plugin. Help!

New User

Re: Linux, Firefox 21.0 and the latest flash FOR LINUX (11.2). I can't view youtube videos because firefox has disabled the plugin. Help!

I see. But, is this new? I have been working with Linux for almost 10 years and my flash plugin has always been in /usr/local/firefox/plugins. I thought firefox first searched foir that directory.

Also, I just upgraded the Firefox installation on my other 2 computers (they both had Linux and version 20.0). This same issue occurred there. I moved the plugins and that was it, they are fixed now.

Also, one remaining issue: can I disable Firefox's function to disable outdated plugins, Flash is not "at risk" and it will eventually becaome outdates, but Adobe won't be releasing more versions. Also, shouldn't the Linux version of Firefox know that 11.2 is and will be the latest for ever and evermore instead of just labelling it old?

Mozilla Support Contributor

Re: Linux, Firefox 21.0 and the latest flash FOR LINUX (11.2). I can't view youtube videos because firefox has disabled the plugin. Help!

Flash isn't blocked now. Since the blocklist may protect you from other problems, I think it would be premature to try to disable it. (As for how to do that, I imagine there are past threads on that.)

New User

Re: Linux, Firefox 21.0 and the latest flash FOR LINUX (11.2). I can't view youtube videos because firefox has disabled the plugin. Help!

The directory structure, at least for linux, seems to have changed for version 21. I have my firefox distribution in /opt/firefox/, and up to now I've keep the flash plugin in /opt/firefox/plugins/. With vers 21, the plugin directory should be /opt/firefox/browser/plugins/ This directory doesn't exist by default. You can create it or just mv the old plugin directory to the new location

$ cd /opt/firefox/ #(or wherever your firefox is installed) $ mv plugins/ browser/

The icons/ directory has also been moved into this sub-directory, which is why my firefox desktop button was not displayed correctly after the update.


Really - the main thing that firefox should be doing is to archive the previous version of firefox whenever it does an update. It is ridiculous to have to deal with this sort of issue immediately after an update when you might have important work to get done in a timely manner!! There needs to be a simple option to temporarily revert to the previous version of firefox. This would be trivial to implement, and could be used when a new version breaks something.

Site Moderator

Re: Linux, Firefox 21.0 and the latest flash FOR LINUX (11.2). I can't view youtube videos because firefox has disabled the plugin. Help!

Since I am the only user I put my plugins in plugins folder located at /home/username/.mozilla/pugins/ and have not had any issues with Firefox not detecting Flash or other Plugins in Firefox 21.0 or new development builds.

Site Moderator

Re: Linux, Firefox 21.0 and the latest flash FOR LINUX (11.2). I can't view youtube videos because firefox has disabled the plugin. Help!

Hi James.

I assume that you mean: ~/.mozilla/plugins/ (/home/<user>/.mozilla/plugins/)

I place as well symlinks to plugins in this folder, but there are more location that are scanned for plugins by some versions of Firefox.