When you’re working as hard to optimize a user experience as PBwiki does, beta browsers present a bit of a dilemma.
On the one hand, we want to support as many of our users as possible. On the other hand, it doesn’t make sense for us to do a lot of engineering work to support a browser until we’re pretty sure that its been stabilized.
For the most part, beta browsers will work, but there’s no official guarantee.
For example, we absolutely plan to support Firefox 3.1. But until the beta is set, we’ll probably hold off on making changes…after all, Mozilla might change the 3.1 code further before it’s finalized, which means that any work we do now could be wasted, or even worse, cause more problems down the line.