And that is the price they pay for trying to be Chrome clone UI wise and not listening to to the "power users". I hate to use the words "power user" but it is the small group of very active and enthusiastic users that you need to give the appears to every one else that they are missing out on something cool. I still use Firefox because it works reasonably for my usage but I stopped promoting it to other people around…
We shouldn’t just look at power users. Google and Microsoft, for example, constantly advertise to use their browser when you visit their properties. I imagine this has an impact.
The problem is that Firefox is basically a Chrome clone at this point, all the way down to the privacy-invading features such as telemetry, so using it nowadays is more down to ideology than actual technical merit.