They are in google pockets for 95% of revenue. But I think as a browser with a smaller market they join things and change things to be like everyone else.

There was a recent change to facebook picture albums that lazily loads pictures as you scroll. In large albums this grinds to a halt after a few pages and each scroll takes 30 seconds to load the next set of images. Chrome handles this smoothly. For social media I had to switch to chrome.

Firefox is still better for privacy and I use it when I can even though it feels like it's slowing down after each upgrade.