Comment 3 for bug 1946599

And interestingly, the patch for https://bugzilla.mozilla.org/show_bug.cgi?id=1732580 appears to fix the problem (actually, I tested the workaround, which is to set `security.sandbox.content.read_path_whitelist` in `about:config` to the value of $SNAP for that revision of firefox, e.g. "/snap/firefox/631/" (the trailing slash matters)).