If you haven’t heard there is one really serious bug that will continue to push back the release if it cannot be fixed. Here is the description of the problem:
Firefox cannot handle eating 10 Taco Bell Burrito Supremes without vomiting.
Everything starts out rendering correctly, but as time progresses, the
rendering slows down… and then about 90 minutes in, Firefox just barfs.
This is the pre-crash image but it looks like they may have gotten the bug worked out in this image. If you want some really good laughs make sure you read the comments in the bug report. Don’t worry though, there really are legitimate bugs that are blocking Beta 2 from being released :D .