The firefox4-4.0-0.14.beta8 package install this new version besides the version 3.x. So you will have 2 entries in the Internet menu.

WARNING : a backup of your profile (~/.mozilla/firefox directory) seems mandatory.

Start by reading :

As always :

yum --enablerepo=remi install firefox4

No xulrunner update, this RPM provides his bundled Gecko engine.

The Add-on compatibility reporter 0.7 allow to enable extension which are not compatible for test.

Some benchmark results:

  V8
More is better		 SunSpider
 Less is better		 Kraken
 Less is better
Firefox 3.6.12 255 2 336.1 ms 105 225.0 ms
Firefox 4.0b6 874 603.8 ms 12 185.7 ms
Firefox 4.0b7 2328 391.8 ms 9 427.9 ms
Firefox 4.0b8 2772 396.8 ms 9 350.0 ms

Tests run on:

Fedora release 14 (Laughlin)
Intel(R) Core(TM)2 Quad CPU    Q6600  @ 2.40GHz