In my opinion, the root cause of this are the exaggerated purity rules in the F-Droid store, as I mentioned here:
The Fennec developers would have everything ready to merge the latest version and resolve the security issues, here is the PR: Fennec 131.0.0 (!63) · Merge requests · relan / fennecbuild · GitLab
But he cannot merge it because of these open source purity rules in F-Droid that require the complete toolchain to be 100% open source, no deviation allowed. Just relax the rule, don’t be such fundamentalists. Then we can have the issue resolved and people don’t need to switch to Google Play store.