I've been playing with the Firefox 3 Alphas.
I have a blog in Hebrew. WordPress' automatic pretty quotes work differently in Firefox 3 Alpha and Firefox 2. You can see a sample post here:
In case you don't understand Hebrew - it's a dialog. Every sentence is enclosed in quotes.
If you try it in Firefox 2 and Firefox 3, you'll see that the quotes appear in reverse.
I'm not sure whether it's a bug in Firefox 2 or Firefox 3, but anyway, i thought that WordPress people should be aware of it, as WP does play around with automatic pretty quotes.