Excellent! Rated 5 out of 5 stars

I've been looking for a simpler, more straightforward method for formatting posts in a forum that uses a mix of BBcode and XHTML tags; none of the Fx extensions I've tried could do it just right for all of the tags. Using this extension with RJ TextEd, however, works great. I just had to put .html first in the File Extensions list (and restart Fx) to make it the default file type for the editor (so that it will properly enable the Preview function in the editor), and it works perfectly (for my needs). Coolness.
Aug2009: updated to latest with Fx 3.5.1 - still works great!

This review is for a previous version of the add-on (1.3.1).