I laughed when I read Mozilla wanted to release Firefox 7 by the end of the year. But Firefox 5 is here, with CSS3 Animations no less, and they have a clear path ahead for improvements in upcoming releases.
As early as last year, using Firefox betas was a huge pain in the ass, and they were always impossible to find. All that’s changed now, check out the release channel to keep up with the latest Firefox betas.