Well, se, the problem with constantly switching PCs is...
I'm spending most of this week on a different computer, but will want to be doing some web developement, so posted mostly for my reference, the addons that I've got installed on the work laptop (which I use for personal stuff when I'm travelling, etc as well):
Application: Firefox 2.0.0.6 (2007072518)
Operating System: WINNT (x86-msvc)
September 16, 2007
Total number of items: 27
Of the above, I continue to strongly recommend
ljaddons, programmed by a Russian, but now does everything LJ Hook does, plus some things other extensions do, plus some things I've not seen elsewhere, and very very customisable.