I'm using plata theme[1]. The only limitation is that FF Color doesn't apply to about:* pages, whereas SF does. I seldom change my settings anyway, so it's not an issue.
That's why I set up my github and gitlab to mirror each other. gitlab can even automatically get the latest changes from my github repo. too bad github can't do this yet [1].
Took me a while to find out that you refer to the AUD amount. Where did you get the global pricing? I selected different countries, but the amounts still show as equivalent to the USD one?
Edit: They are using paypal rate (or close to it).
[1]: https://nextdns.io/