I've tried out the nightly snapshots of Firefox Minefield and yes, it is faster than Chrome even with my 12+ plugins.

http://www.linuxhaxor.net/2008/09/28/firefox-minefield-faster-than-chrome/

I'm sure a lot of people are familiar with the FireFox extension called GreaseMonkey. The extension allows you to manipulate the JavaScript present on any website you visit. For instance, if you want to displaying text is a specific way, you can. You can also change the colour or look of site with your own custom JavaScript.

9. Flickr Follow Comments - This useful script helps you to view images that you have commented on - but only those that interest you. If you are writing lots of comments every day you know how hard it is not to get distracted by the overload of images when you click “Comments You’ve made”. With this userscript you have 4 different options to see only certain types of comments.

Sandboxie will isolate the outcome of any website you visit, including any software or script installations, which can then be undone.

If you're a hard core HTML/CSS/PHP hacker, this list will come in handy. It has lots and lots of tools that will help you with the average day hacking. Some will shave off minutes from development time and other hours.

Essential List on Firefox Extensions for Webmaster The Essential List and Resources on Firefox Extensions is a popular post here, due to one reason - Firefox has too many extensions and it is difficult and time consuming for a user who just wanted to install some cool extensions to get started on their Firefox journey. Because our original list was more toward normal and daily usage - and being a part time webmaster and blogger, I want to introduce some of the extensions I used to assist my webmaster responsibilities and tasks. Oh yes, I will only display extensions that save my web developing time for other tasks and projects in my life. Same drill here - I am going to list some must have, should have and good to have extensions, based on my experience and usage:

Unfortunately there is no swiftweasel for debian etch/testing:

I had to browse to the SourceForge project page, and download the appropriate version for my machine, which is a athlon64/32bit.

I just untar'd the file, and ran ./firefox from within the directory and it picked up all my settings and everything. Next I had to set it up so that I just had to type firefox within a console. So I created a symlink in my 'bin' folder with all my other custom perl scripts and other command line programs/scripts:

I also had to setup my fluxbox keybinding like so:

I originally was using "iceweasel" which is the Debian fork of Firefox, you can read why Debian had to fork Firefox on WikiPedia

I do notice a difference, pages load pretty fast and the FasterFox Plugin helps. However they packaged an extension called "AdBlocks" which I've never used and I don't really like. But for now I have just removed it.

Swiftweasel 2.0.0.4.1 (Default branch) - Swiftweasel is an optimized build of the Mozilla
Firefox Web browser for Linux. It offers builds
for both AMD and Intel processors. Swiftweasel is
100% compatible with all Firefox themes, plugins,
and extensions.
License: Mozilla Public License (MPL)
Changes:
The update notifications feature that made its
first appearance in 2.0.0.5pre is installed. When
a new version is available, you will be notified
so you can get it. Further font rendering
improvements were done. Automatic detection of
plugins is done in common directories in the file
system. A few more build tweaks were made. The
"Release Notes" option in the Help section brings
up the release notes.
[FreshMeat]

I remember first hearing about flock. I actually got a version of it when it was just skinned to look different than FireFox. I didn't expect the project to get this far. Give it a wirl, looks to be promising.

Flock 0.9 lands gracefully - The Flock project has been building a "social Web browser" since 2005. The upcoming Flock 0.9 release adds new blogging features, integrates media streams into the browser, and includes an overhaul of the Flock bookmark system. It's not perfect yet, but Flock 0.9 is a big leap forward. [Linux.com]