Firefox

Honestly, it’s possible. A lack of incentive is half of the issue, the other half is the lack of talent working on a jailbreak because the community is full of the most maddeningly annoying children to have ever been birthed. It’s much more profitable to sell the increasingly complex bugs than to use them. If the jailbreak community manages to avoid doxxing, threatening, or disparaging a major dev for a few months, something might eventually come out.