Firefox does display these editors nicely, so we use it.

However, Firefox 1.0.2 routinely stops responding to mouse clicks after about an hour on a fully updated Panther system. I have to force quit and re-launch it 6 times a day. Very irritating. Netscape also displays this behavior, so it would seem to be the underlying common code. I'm surprised this is not more discussed.

If Safari / OmniWeb under Tiger can display those HTML editors, I won't have much regular need for Firefox.

And for what it's worth, OmniWeb 5 is by far the best overall browser for OS X. Sure, it costs $30, but so what? You live half your life in it.

Furthermore, the extremely good DEVONthink and DEVONagent both have Webcore browsers in them. Some DEVON users don't even use a straight browser, just those personal info management apps. devon-technologies.com. No connection to any of these companies.