We talked before about the new API extensions, but that pales in comparison to the single great thing about Firefox 1.5. Here it is —
You can now punch the monkey without fear of commitment.
Since they improved pop-up blocking, including pop-ups spawned from Flash and Java, you can now play all those stupid Flash games without fear of getting stuck in pop-up Hell. I’ve been throwing a boomerang at a swinging chimp for a few minutes now.