I downloaded Firefox 1.5 RC1 on Monday. They've been plugging it for a while on the Firefox download page, and while I did get one of the alpha versions a while back, I stayed with 1.0.x. Now that all my extensions and themes seemed to be compatible, I decided to switch.
Anyway. Since the switch, nothing's really changed... A few new features here and there, otherwise not to different from 1.0.x. But... There seems to be a margin bug in 1.5 that wasn't there before. Example: if you're using FF 1.5, see the bottom of this page (press End to go directly there). See how the background seems to jump slightly to the right? That doesn't happen in any other browser (except IE, but IE can be hacked). So... what to do? I changed the margins of the footer so that the background would match, but then it looks out of place on Opera and Firefox 1.0+. I did search around for some tips, but it seems no one else has picked up on this. *Sigh* I might have to wait for RC2 to come out for this to be fixed... I hope not, since I hate it when my site doesn't look right, but oh well.
Edit: Hmmm, I think I fixed it... I aligned the background all the way to the left instead of the middle, then used a wider left margin. I tested it in IE 6, FF 1.0.7, FF 1.5 and Opera 8.5. Let me know if it still looks wrong to you. :)