I'm a little emberassed, but after reboot the extension works now in Firefox. No idea, was has happened, but I guess this can be closed. o.O
-- /"\ ASCII RIBBON | »With the first link, the chain is forged. The first \ / CAMPAIGN | speech censured, the first thought forbidden, the X AGAINST | first freedom denied, chains us all irrevocably.« / \ HTML MAIL | (Jean-Luc Picard, quoting Judge Aaron Satie)
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