Yettwasezmel 5 ɣef 5 n yetran

sɛur Julian Knight di Dec. 14, 2013 · aseɣwen yezgan

Works fine on all newer versions of FF at least up to 26 (current at time of writing this). Used it constantly for some years now and would probably switch browsers if something like this wasn't available.

You don't need the Compatibility Reporter but you do need to install from the plugins web site as it won't be found from the Add-ons Manager.