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[[https://bugzilla.mozilla.org/attachment.cgi?id=281427 Attachment has been removed but I tested with <iframe width="100%" height="100%"> this tag, no slow rendering and painting ]]
'''397031''' NEEDINFO Crash @ BuildTextRunsScanner::BuildTextRunForFrames '''397303''' Thebes rendering of inset/outset borders very slow Work on
'''397320''' Setting opacity on div-surrounding-img significantly slower than on img