Faster FireFox with FasterFox

Fasterfox is a firefox plugin that can increase your browsing performance.

There are four different settings you can choose :
1. Courteous preset performs rendering tweaks only and does not increase web server load.
2. Optimized preset increases browser performance by performing network optimization within RFC specifications.
3. Turbo Charged preset is active by default and exceeds RFC specs by increasing web server load for maximum performance.
4. Custom preset lets you modify browser cache capacity as well as DNS cache expiration and entries.

Some other features that are included in custom option:

* Prefetch Links
Dynamic speed increases can be obtained with Fasterfox's unique prefetching mechanism, which recycles idle bandwidth by silently loading and caching all of the links on the page you are browsing.

* Tweak Network
Fasterfox allows you to tweak many network and rendering settings such as simultaneous connections, pipelining, cache, DNS cache, and initial paint delay.

* Page Load Timer
A millisecond accurate page load timer tests the effectiveness of your settings.

* Block Popups
A popup blocker for popups initiated by Flash plug-ins is also included.

You can download the latest FasterFox for FireFox 2.x from here.

UPDATE :
For FireFox 3.x you can find it here.