Have you tried making a different desktop entry/shortcut for each Firefox profile and then setting a browser picker as your default browser? - Junction (Linux

Have you tried making a different desktop entry/shortcut for each Firefox profile and then setting a browser picker as your default browser? - Junction (Linux browser picker): https://github.com/sonnyp/Junction https://github.com/sonnyp/Junction - Finicky (macOS browser rule setter): https://github.com/johnste/finicky https://github.com/johnste/finicky and Browserosaurus (macOS browser picker): https://github.com/will-stone/browserosaurus https://github.com/will-stone/browserosaurus - Hurl (Windows browser picker): https://github.com/U-C-S/Hurl https://github.com/U-C-S/Hurl