Opera tends to have compliance as a badge, i.e. they have the minimum possible in each area to put it on their marketing, while Firefox tends to be compliant 100% in common areas and have little support for generally unused parts of the standard. Neither is perfect, of course, and full inline SVG in Firefox is desirable.
Iceweasel >>>>>>> Firefox>Opera>Safari>Konqueror>IE7>>>>IE6 is my opinion.
Ubuntu. Linux for human beings.
If you are interested in trying Ubuntu or Linux in general, PM me and I will answer your questions and help you install it if you wish.







