Feature request: specify browser

I'd find it useful if 1P had some mechanism to let me select a specific browser to be launched for an item when doing "Open and Fill".

I use one browser (Brave) for all my routine browsing, and another (Safari) for special things like banking and also for some sites that don't play well with Brave. I have different security configurations on each, re saving cookies, syncing to phone, JavaScript, etc. 

It would be lovely if I could configure "Open this with Safari" for the small number of special sites.