Contact: MoinMoin:ThomasWaldmann (better use that page than this page here, there is also my email etc.)
I'm a long-term Netscape/Mozilla/Firefox user and I like it.
My contribution to OSS is developping the MoinMoin wiki engine in the core development team, see The MoinMoin Wiki HomeWiki for details. I use Python for coding and I love it. :)
By developping this wiki, I also sometimes stumble over Firefox bugs and usability issues, see my talk page. Compared to IE, Opera and Konqueror, it is much less, though, congrats to the Mozilla/Firefox developers!
We recently integrated the FCKeditor JS WYSIWYG editor and a converter from the html the editor produces to moin wiki markup, showing up quite some issues, too.