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Before, we were comparing Principals sent up from PluginContent against the Principal of the selected browser - this was in order to account for races (and intermittent oranges) where the browser has moved away from a page before a CTP message has been received by the parent. Comparing Principals works beautifully, except in the case of Data URIs, since Data URIs inherit the Principals of the page they were linked from. That means that if we're on a page with a link to a Data URI that embeds a plugin, if we quickly browse to that page and back before a CTP message reaches the parent, when the CTP message finally arrives, the Principals will match. We solve this by sending the location as well as the Principal, to do a final comparison if the Principals do match. --HG-- extra : rebase_source : 095706306d241a254f62b28527a96a427d7e55c3 extra : histedit_source : 3afe814271166f70afce6a423bbb7809c5a983c7