LinHES

Had some extra time to work on installing Firefox 21 on an R8.02 Test Box.
Installation information of Firefox 21 on Arch is very limited on the Web today.
Moreover, no nice PKGBUILD like google-chrome's. Also flash is not embedded as in google-chrome.

Packages Needed
https://www.archlinux.org/packages/extra/x86_64/firefox/download/
https://www.archlinux.org/packages/extra/x86_64/nspr/download/
https://www.archlinux.org/packages/extra/x86_64/nss/
https://www.archlinux.org/packages/extra/x86_64/startup-notification/download/
https://www.archlinux.org/packages/extra/x86_64/xulrunner/
https://www.archlinux.org/packages/extra/x86_64/sqlite/download/
https://www.archlinux.org/packages/extra/x86_64/libpng/download/

Installation
pacman -U nspr-4.9.6-1-x86_64.pkg.tar.xz
pacman -U nss-3.14.3-3-x86_64.pkg.tar.xz
pacman -U startup-notification-0.12-3-x86_64.pkg.tar.xz
pacman -U xulrunner-21.0-1-x86_64.pkg.tar.gz

Next
tar xvf libpng-1.6.2-3-x86_64.pkg.tar.gz
cd usr
cd lib
cp libpng16*.* /usr/lib/

Then
tar xvf sqlite-3.7.17-1-x86_64.pkg.tar.xz
cd usr
cd lib
cp libsql*.* /usr/lib/

And don't forget
ls -s /usr/lib /usr/lib/firefox

and
pacman -U firefox-21.0-1-x86_64.pkg.tar.gz

You can now launch Firefox 21

Hope this will encourage more users to upgrade to R8.02.