I don't usually take on xHTML work, but I'm looking to start expanding the services I offer.

I work full-time as a freelancer, so I have 30-40 hours a week I can devote to projects.
Regarding the Firefox extension question: I use both Firefox Web Developer extension, and Firebug. Depending on the issue at hand.

Previous works:
http://psdtovb.com/xhtml/ePayDay/
http://psdtovb.com/xhtml/SocialEnterpriseSearch/
- There's a lot of subpages that go to that, I can link you to them if you want to delve deeper. Otherwise they can be seen at: http://is.gd/A3iy the code may have been altered on there though.
http://psdtovb.com/xhtml/TehFriends/home.html

Shoot me a PM if interested, and I'll give you my Msn/Skype/Email.