Yettwasezmel 3 ɣef 5 n yetran

sɛur Timur Suzi di Jan. 17, 2011 · aseɣwen yezgan

Shadow912's version works with Firefox 4 beta 9 if you set up maxVersion manually.
Unzip xpi archive, find install.rdf, change maxVersion parameter then zip again and change extension to xpi.