Yes, my first browser was Mosaic, and I've been working as a professional web developer since before Firefox existed.
Firefox benefitted from years of stagnation and neglect of IE by Microsoft. And even then, when it was clearly the superior product, it took years to gain a significant portion of the browser market, and it still never managed to get much over 20%. Only Google, with the most popular website on the planet, and billions of dollars to spend, managed to actually dislodge IE.
As things stand, Chrome is not stagnating or neglected. Firefox is a good browser, but it is by no means a clearly superior product. There is a vastly larger number of deployed PCs, using Chrome as their default browser, than there was in the early 2000s. Mobile has replaced the desktop as the dominant consumer computing platform, where installing and using a replacement browser is far less likely. There are far more apps and content optimised for Chrome than there ever was even for IE, and the quantity is expanding all the time.
For all these reasons, and more, I am convinced that advocacy and evangelism alonge will not succeed to change the situation, and such efforts, while noble-minded, are mostly a waste of time.