Mozilla Firefox - Recommended

Level of Support: 100%
Speed: Fast
Version: 3+

http://www.getfirefox.com

Google Chrome - Recommended

Level of Support: 100%
(PNG graphics sometimes glitch, especially when transparency is used (spell effects) - that is for them to fix though, not me )
Speed: Fastest
Version: 1+

http://www.google.com/chrome


Safari

Level of Support: 95%
Speed: Fast (maybe a bit slower than firefox, not much though)
Version: 3.2+

http://www.apple.com/safari/

Opera

Level of Support: 95%
Speed: Slow on some systems (havent figured out what causes slowness yet), as fast as firefox on others
Version: 9+

http://www.opera.com


Internet Explorer 8

Level of Support: 95%
Tooltip bugs
(PNG graphics sometimes glitch, especially when transparency is used (spell effects) - that is for them to fix though, not me )
Speed (Loading): Slow (2-3 times slower than Chrome)
Speed (Playing): Slow as Hell

http://www.microsoft.com/windows/Intern ... fault.aspx

Internet Explorer 7

Level of Support: 90%
(PNG graphics sometimes glitch, especially when transparency is used (spell effects) - that is for them to fix though, not me )
Speed: Slow as Hell! (6-8 times slower than Chrome)