If you just want extension support without a whitelist, Firefox Nightly for Android lets you supply a custom list of extensions (called an AMO) which you can add any extension to.
It's a bit inconvenient but you only need to do it once. I like Kiwi as well and it seems to get frequent updates now, at least as github releases (play store version is updated less often).
The question is, why I would want to install a nightly just for add-ons?
To my knowledge you f.e. need an add-on to block a specific cookie, because FF Android doesn't have this option...
The question is when/if the product manager at Mozilla will realize the state of the browser at some point :/
I can just say that as far as I am concerned, the only thing that is keeping me with FF Android is the vendor lock-in with FF Sync.
Thats a lot of fragile manual steps, not to mention needing a user account and being dependent on Mozilla infra. Hardly straightforward + not to mention addons on Android Firefox overall still barely working in the new Android version, with no visible progress to fix that.
I loved this idea, but it doesn't seem to work for me. I can browse a long list of extensions at this collection on the web [0], but FF Nightly only shows a small subset of them.
https://blog.mozilla.org/addons/2020/09/29/expanded-extensio...