Is there any evidence that edge won't switch to manifest v3? As far as I understand Edge merges in Chrome updates.
Edge is based on Chromium. You're better off with Firefox.
I would not recommend Safari as I have completely stopped supporting it many years ago due to Apples hostile approach towards developers and the fact it's broken beyond internet explorer levels and has been in this sorry state for at least a decade. I don't know if people still using it have some special use cases or just don't know you can install another browser.
Oh for crying out loud, no, it is not broken "beyond internet explorer levels".