Performancing is a full-featured blog editor that sits right within Firefox.
# addons, firefox, weblogging
CustomizeGoogle: Improve Your Google Experience–a Firefox extension that provides ad-blocking, links to alternate search engines, links to bookmarking services and lets you filter search results. Good stuff.
# extensions, firefox, google
VideoDownloader is a Firefox extension that, well, lets you download video from YouTube, Google Video and more than 60 other sites.
Try it out with the lovely videos listed here, ranging from Basquiat painting to Borges lecturing.
# art, extensions, firefox, video
Tab Mix Plus is a must-install Firefox extension: tons of tabby goodness, and a reliable session manager in one. (It replaced three extensions I used to use, and Firefox is running much more smoothly now, too.)
# extensions, firefox, tabs
FoxiPod is a dinky little app combined with a Greasemonkey script that makes downloading an MP3 and adding it to iTunes a one-click process. Slight downsides: it’ll only work on pages with a direct link to MP3s, and it doesn’t tell you where it downloads files to – ~/Music/download.
# download, firefox, itunes, MP3
Firefox Themes to make the browser all pretty like on OS X.
# firefox, themes