The refactoring of Browser Cache feature in the last release uses the full title URLs now for ffnet stories.
It looks like FanFictionDownloader still uses ffnet story/chapter URLs without the title, which FFF doesn't look for now.
Honestly, I don't think I remembered to test with FanFictionDownloader. I assumed it was the same as Chrome.
I'll think about whether there's something I can do about that or not. My computer time is limited right now due to a medical issue.
In the meantime, you can downgrade to FFF v4.19 or switch to using one of the other methods instead of FanFictionDownloader. The open_pages_in_browser feature is what the refactoring was for.
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