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Amazing! Do you know if anyone tried to run this on a Sage?

After getting that Kobo I realized that my hyper specific reading needs require a web browser with extension support (in particular support for Yomitan or similar dictionaries; the built-in dictionary functions on e-readers are awful for most non-English languages even with custom dictionaries, and KOReader isn't any better in that regard)

Not that I know of, and it isn't listed as a supported device on the pmOS wiki: https://wiki.postmarketos.org/wiki/Category:Kobo

I can run Firefox on my Kobo Clara HD, but it's not a pleasant experience. It is very, very, very slow.

What's the battery life like on Kobos running linux? Is it on the order of weeks, days, or hours?

For my daily reading before sleep usage, it is around 2 weeks.

Wow, had no idea this existed, thanks for writing it and sharing it!