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Have a later model, the Pocketbook Verse (not the pro edition). Flashed KOReader on it which was much easier than anticipated. Have a couple extra features in the reader that way.
It does as promised. I just plug it into my devices to get epubs onto it. You don’t even need a book management software like Calibre, you can use it similarly to how you’d use a thumb drive.
I too want to domesticate a Firefox