Download Firefox 3 Release Candidate 1
Firefox 3 release candidate 1 (RC1) is available for download from official project web site. Firefox 3 is based upon Gecko 1.9 engine, which has more than 14,000 updates including some major re-architecting to provide improved performance, stability, rendering correctness, and code simplification and sustainability. Firefox 3 has been built on top of this new platform resulting in a more secure, easier to use, more personal product with a lot more under the hood to offer website and Firefox add-on developers.
Quick Firefox 3 RC1 Installation
Type the following command at a shell prompt:
$ cd /tmp && wget 'http://download.mozilla.org/?product=firefox-3.0rc1&os=linux&lang=en-US'
$ tar -jxvf firefox-3.0rc1.tar.bz2
Backup existing settings:
$ mkdir ~/backup
$ cp -avr ~/.mozilla/ ~/backup/
Now install new firefox at /opt:
$ sudo tar -jxvf firefox-3.0rc1.tar.bz2 -C /opt/
Start Firefox:
$ /opt/firefox/firefox &

(Fig.01: Firefox 3 in action [click to enlarge image])
Download FireFox 3 RC1 for Windows / Linux / OS X
A word about addons
Following addons are not compatible with FF3:
- Firebug (beta version should work with FF3, see comments below)
- Yslow
- Google toolbar
- Stumble toolbar
Updated for accuracy!
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Tags: download firefox 3, firebug, gecko, Linux, Mozilla, OS X, performance, rc1, release candidate 1, Update, wget, Windows



Firebug 1.1beta does work in FF3 at least up until FF3.0b5
Yeah, Firebug beta works great–as does FF3B5 in general. I hope no one just sees this article and says, “Eh, I guess I’ll wait, then.”