Here is a dump of my current FireFox add-ons.

firefox-addons.png

Some of them are particularly relevant to SEO/SEM:

  • Diigo — Great when you have a group that wants to annotate web pages to share notes on SEO mods you want to do for a page.
  • Live PageRank — Get the PR for a page.
  • Send Tab URLs — A quick and dirty way to get a dump of page URLs and descriptions by opening up the pages you are interested in Tabs, then selecting this option in the File menu.