So this morning I was greeted with Firefox 9. Trouble is, a couple of our internal wikis run old versions (1.13 and 1.15) and ... old Monobook appears to be broken by FF9. The sidebar appears only after the page content, leaving a large empty space between the wiki logo and the sidebar. Screenshot of the problem on our tech wiki: http://oi42.tinypic.com/35lbz7o.jpg This is only broken in FF9 - it's fine in current Chrome stable, for example. Any ideas where we'd go into Monobook to fix this? Wikipedia with "useskin=monobook" is not broken in the same manner. (I realise the actual answer is "upgrade those ancient MediaWikis already". But the 1.15 is a somewhat fragile combination of MediaWiki, Semantic MediaWiki and customisations ...) - d.