Install Mozilla Firefox 4 on Fedora 14, Fedora 13 and Fedora 12 1. Backup your current Firefox 3 profiles tar -cvzf $HOME/mozilla-firefox-profiles-backup.tar.gz $HOME/.mozilla/firefox/ 2. Change root user su - ## OR ## sudo -i 3. Install Remi repository ## Remi Dependency on Fedora 14 ## rpm -Uvh http://download1.rpmfusion.org/free/fedora/rpmfusion-free-release-rawhide.noarch.rpm rpm -Uvh http://download1.rpmfusion.org/nonfree/fedora/rpmfusion-nonfree-release-rawhide.noarch.rpm ## Remi Dependency on Fedora 13 and Fedora 12 ## rpm -Uvh http://download1.rpmfusion.org/free/fedora/rpmfusion-free-release-stable.noarch.rpm rpm -Uvh http://download1.rpmfusion.org/nonfree/fedora/rpmfusion-nonfree-release-stable.noarch.rpm ## Fedora 14 ## rpm -Uvh http://rpms.famillecollet.com/remi-release-14.rpm ## Fedora 13 ## rpm -Uvh http://rpms.famillecollet.com/remi-release-13.rpm ## Fedora 12 ## rpm -Uvh http://rpms.famillecollet.com/remi-release-12.rpm 4. Check Available Firefox 4 versions yum --enablerepo=remi list firefox Output: ... Available Packages firefox.i686 4.0-1.fc14.remi @remi 5. Install Mozilla Firefox 4 yum --enablerepo=remi install firefox Output: ... Setting up Install Process Resolving Dependencies --> Running transaction check ---> Package firefox.i686 0:4.0-1.fc14.remi set to be updated --> Finished Dependency Resolution Dependencies Resolved ========================================================================================= Package Arch Version Repository Size ========================================================================================= Installing: firefox i686 4.0-1.fc14.remi remi 14 M Transaction Summary ========================================================================================= Install 1 Package(s) Upgrade 0 Package(s) Total download size: 14 M Installed size: 33 M Is this ok [y/N]: y Downloading Packages: Setting up and reading Presto delta metadata Processing delta metadata Package(s) data still to download: 14 M firefox-4.0-1.fc14.remi.i686.rpm | 14 MB 00:05 Running rpm_check_debug Running Transaction Test Transaction Test Succeeded Running Transaction Installing : firefox-4.0-1.fc14.remi.i686 1/1 WARNING : This firefox4 RPM is not an official Fedora build and it overrides the official one. Don\'t file bugs on Fedora Project. Use dedicated forums http://forums.famillecollet.com/ Installed: firefox.i686 0:4.0-1.fc14.remi Complete! 6. Start Firefox 4 Then start Firefox with FF4 profile using command: firefox Use Firefox 4 launcher Firefox 4 Launcher on Gnome Desktop Note: If you use separated profile for Firefox 4 then modify launcher too