Mozilla

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Customize Firefox

Stay In Sync Sync seamlessly connects your desktop and mobile Firefoxes, so you can access your browsing history, passwords, bookmarks and even open tabs no matter which device you use. Now you can surf the Web on your desktop, get up in the middle of browsing and have your open tabs ready and waiting on your mobile, just as you left them. http://www.mozilla.org/en-US/firefox/customize/
http://cybernetnews.com/reducing-your-memory-usage-in-firefox/ There has been a lot of talk about how to optimize Firefox to run the most efficiently.

Reducing Your Memory Usage In Firefox

MozDev

http://www.mozdev.org/ The mozdev.org site provides free project hosting for Mozilla applications and extensions.
http://www.mozdev.org/projects/applications/SeaMonkey.html Visualize who's tracking you in real time.

mozdev's SeaMonkey Extensions

The Sea Monkey Project

The SeaMonkey project is a community effort to develop the SeaMonkey all-in-one internet application suite (see below). http://www.seamonkey-project.org/
http://www.seamonkey-project.org/community Development of the SeaMonkey Internet Application suite software wouldn't be possible without the vibrant community of developers and users that form the SeaMonkey Project.

SeaMonkey Community