Quite possibly, although while using 1.5RC1 this is the only site which has caused me a problem... since the menu sorts itself out after a reload it could be using a slightly iffy (IE specific?) event - I may attempt to debug it if I get time, but it looks poor and at this stage in the game I'd be surprised if it's a bug in Firefox 1.5RC1 . If it is, it's probably too late to be fixed and will have to wait until the next branch. And since the menu is broken in Firefox 1.0.x too, it's clearly not a bug introduced into the beta/release candidate!