There was recently a Firefox vulnerability exploited in the wild. It was patched very recently, so any build before that, ie August, would be vulnerable. Maybe it's that?
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Thanks, yeah, it's probably that. Just odd that they didn't patch it quickly like usual.
There was a problem with compiling some of the software in the Fennec F-Droid build chain from source. That's why it's taking F-Droid a while to ship an update;
In the meantime you can get more recent versions of mobile FF-based browsers by adding the DivestOS repo to your F-Droid client. But it requires uninstalling, then installing from that repo.

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Fennec vulnerability? Recommended to uninstall
Feel free to immediately close this topic. I just want the F-Droid team to see this after they had to deal with all those entitled people in Fennec...