I use modify epub occasionally to fix epubs. I wish it did a better job of removing javascript from epubs. But in general I find polish epub to do a better and simpler job.
I'm in the middle of digging into gnome shell extensions right now or I'd start looking at modify epub and quality check. Maybe in a few weeks I can look into it.
Maybe it would be interesting to start a new thread for people to collect what features they'd like added (or have already partially written) for modify epub and quality check.
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