it's possible this exists already but control from user space is ultra restrictive. Can't freaking do anything. But on desktop or laptop computer when Firefox crashes or closes unexpectedly, there's supposed to be a prompt which asks if you'd like to restore tabs u had open. If yes, then it'll open all tabs you had usually.. They got this from ChromeOS who have this for years now i think. that's not really answering your question but i kinda imagine that's the action u wish to happen ultimately. Also recently saw an extension or addon which could open all linked urls written on a page into their own individual tabs at the same time. maybe you could find their github and request a feature like the one u wish to have. Id bet they can do it