You will get a lot of opinion in this thread but I think it will be slightly empty calories. Browsers are a messy segment. You cannot install once and then not worry about it if your idea of privacy is not like Google's or Apple's etc. I don't think we can make any good predictions 10 years into the future regarding software while a wave of slop washes over the industry. So-called AI may improve the work of small teams like LW eventually but frankly I remain skeptical. Something might happen that washes incumbents like FF out of the market completely, hashtag Netscape. You just have to follow the news and decide if you need to switch.
I think it's a good idea to have a second favourite. If your fav is Firefox based, find a Chromium based one as an alternative or vice versa. So when possible fecal matter hits the ventilator in the future, you have a plan B.