No bug - Add a comment to nsStyleSet::SizeOfIncludingThis noting that it does _not_ count the size of the sheets in mSheets, only the size of the mSheets buffer.
Bug 1011806 - Stop loading user-agent and user style sheets for SVG-as-an-image (the main UA sheets svg.css, html.css, etc. will still load on demand). r=bz CLOSED TREE