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I have installed Edubuntu 12.04 and have ltsp working. This is installed in a classroom setting and I would like to use a content filter in Firefox as an add on. The add on I would like to use is ProCon. The problem that I am having is that I Would like to install this add on globally to Firefox and not have to install it on every user account. Can you help me?

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Instructions how to install extensions for all users are found on following url, however this disables the automatic update of the extensions and needs manual upgrades.

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just to add the fact in the link privided by ThinLinc the folder is in your case : /usr/share/mozilla/extensions/{AppId} . About the AppId thing you must install it in your session and then You'll be able to find the appid folder of your extension over there : ~/.mozilla/ . Just copy the "appid" folder into the folder that I've mentioned and do a chmod -R 755 appid folder and you should have it for everyone. – Antoine Rodriguez Oct 13 '12 at 13:13

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