To use these add-ons, you'll need to download Firefox.

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Iceggiren i Download with JDownloader

Download with JDownloader sɣur Joe Ertaba

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Icegger-it Doug
sɣur Doug, 6 jierren lyn
It doesn't work with Firefox now, only Chrome.

Don't waste your time; it's been reported on GitHub with no response from the dev.
What a shame. I donate to FOSS projects that don't suck.