Yes, the browser game market is dead except for gambling and education - that’s because browser games run instantly with 0 installation.

Almost no jobs. However, if you can find them they pay much better than Unity/Unreal jobs because html game dev is such a rare skill. The decision tree you need to follow to end up as a html game specialist is so fraught with distractions almost no one ends up there.

But, for those who do I recommend Phaser.