You do understand that I have left the extension open-source by purpose, right?

The source is FREE (and will be), constantly maintaining it is a chore and thus a small one-time paywall and if you are not satisfied with the monetization decision, you're happy to downgrade; it just won't receive further updates. I believe that's a fair compromise.

I had a donation page for a month, but as you're an intellectual, you'd already know if people contributed or not.

It's currently priced at 5.99$ as a one-time lifetime license fee, is that a deal-breaker for you or you'd want a lower price, or paying is completely out of the question?