Couldn’t load XPCOM

I wanted to upgrade my firefox browser to firefox-4.0.1-1 I’m, installed it but i initially got this error “Couldn’t load XPCOM”

The error I supect maybe related to “xulrunner” since upgrading my firefox also implies upgraded my xulrunner version to xulrunner-2.0.1-1.

THE SOLUTION then was to: downgrade packages, reverting back my firefox to firefox-4.0-1 and my xulrunner-2.0.1 solved the problem.

Going to /var/cache/pacman/pkg is always my friend since almost all of my old/older version of packages are stored in this directory.

$ cd /var/cache/pacman/pkg

$sudo pacman -U xulrunner-2.0.1-i686.pkg.tar.xz
$sudo pacman -U firefox-4.0-1-i686.pkg.tar.xz

then rerun my firefox and back to normal!

No upgrade for Firefox for now using pacman. =)

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