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I have a Debian x86_64 system with Firefox installed from Mozilla's tar.gz.

On the addons page (hit CONTROL+SHIFT+A then go to the Plugins tab) there is a link: "Check to see if your plugins are up to date." When I click on it displays: Shockwave Flash 11.2 r202 vulnerable. When I click on "Update now" the version presented to me to download is:

Adobe Flash Player version
Your system: Linux 64-bit, Firefox

Which is the same I already have.

Additional information

The version string in Add-ons Manager's Plugin tab is: Shockwave Flash 11,2,202,291

# /usr/sbin/update-flashplugin-nonfree --status
Flash Player version installed on this system  :
Flash Player version available on upstream site: - auto mode   
  link currently points to /usr/lib/flashplugin-nonfree/
/usr/lib/flashplugin-nonfree/ - priority 50
Current 'best' version is '/usr/lib/flashplugin-nonfree/'.
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This is probably because 11.2 is the last supported version for Firefox on Linux. Flash is up to version 11.7.something on chrome and other OSes.

See here:

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