What are the alternatives? Only a massively moneyed corp has the resources to fight vulns at acceptable rates. Firefox doesn’t count because they’re being funded by Google.
For as long as the funding for Firefox continues, it remains a viable option. And despite all their bad decisions of late, they still give users the ability to configure or disable user hostile components.
Their funding model is a risk, but I've been using Firefox and librewolf forever and I'd argue it's a much better option than chrome or edge, especially with a handful of plugins. A risk is still better than the actual realization of the risk.
Even if that were true, it's still a better option _today_.