[ubuntu] Chrome Firefox extensions problem

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http://ubuntuforums.org – I have for some time suspected that web sites would modify web browsers for their own purposes this essay tends to confirm that, in spades Reference C/Net 2012-12-26 worse, it seems they let the "extension" (un authorized program) install itself and then graciously "permit" the owner to "authorize" it -- or leave it suspended to me program modifications should be blocked, period. otherwise it leaves us to ask: what all is our browser actually doing ? it executes using the logged on user's authority and thus has access to everything the logged on user has acc (Hardware)