I don't know if it's just me or others feel the same, but for me, the main reason why Chrome gained more market shares than the others was primarily because of

I don't know if it's just me or others feel the same, but for me, the main reason why Chrome gained more market shares than the others was primarily because of their developer's toolkit embedded with Chrome. This helped a lot of developers to switch from Firefox (which was the best at the time) to Chrome and the result was that most websites were first Chrome compatble, then the others. Visitors quickly understood it, and made the switch too. I sincerely believe that the core reason is the developers, and if Firefox would focus more on that part, it would help get back many of it's old users. I don't say here that the dev toolkit on Firefox is garbage, absolutely not, but it feels clumsy, and a lot of elements are not evident to use and requires more thinking than Chrome. (this is MY opinion). I'm curious to know if you feel the same?