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Reported to me by MatmaRex in #mediawiki channel: the wordmark at http://www1.webplatform.org/stewards/mozilla/ is a 80 KB, 4,708 x 1,904 PNG it should probably not be larger than the displayed size it's comparably huge and looks ugly scaled by the browser
I just checked and it now seems to be a 400x162 px image which is much smaller and looks better. I am going to set the status here to resolved since it seems to be fixed.