Om dizze add-ons te brûken, moatte jo Firefox downloade.

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Matte Black (Blue) troch Elijah Lopez

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It does, Firefox is just being dumb. https://github.com/elibroftw/matte-black-theme/blob/master/Matte%20Black%20Series/Matte%20Black%20(Blue)%20Firefox/manifest.json#L17