Firefox is increasingly unfriendly to power users. Wouldn't surprise me if they got rid of this feature someday because they have statistics showing few people use it.
That irritating and horrible; but until they follow that trend to conclusion, it's not a reason to switch at all.
I see this so much so, it's to the point that If I see you're using something else, I assume you're not a developer, and you're likely not a power user.
Everyone is there for a different minority used feature. By caring only about the feature used by the majority, you are actually satisfying no one.
That’s why product managers use persona on top of metrics. Nice products have niche features and some kind of personality. You don’t want to overfocus on them but stripping them all is a losing move.
Sigh, I've been using Firefox for almost 2 decades, and this is the first I've heard of this feature.
If you only focus on the most popular features you eventually narrow your product to one feature, so obviously there is a balance in there somewhere between focus and utility as well. Identifying why people use your product is as important as knowing what they use. Chrome does all the things I actually use from Firefox, but I use Firefox because when I ever need slightly more hackability it is there for me. That is at best, a once a year occurance.