I have installed lots of extensions on FF because I find them to be useful. If I were to use Chrome as my primary browser and wanted the same features that my current FF setup gives me, then I would have to install extensions. But the extensions would slow Chrome down and then I would be back to square one. So "just use Chrome" is not a solution.

Maybe not for everyone. I find myself alone amongst many because I hate tools. The need for a tool means there is some problem that has to be solved. For instance, I much prefer languages that don't necessitate an IDE. I'd much rather program in Ruby, Python, Javascript, or anything else I can do competently in vi, with a 5 line .vimrc file. Even when in vi I only use like 5 commands. I find other ways to be effective. I can boot up Eclipse or IntelliJ or whatever and get the job done, but certainly there has to be a better way?

I installed Chrome because its fast. I liked it for web development because it had "Firebug" essentially built in. I eventually peeked back at Firefox to see if was doing anything interesting on the development side, but by that point much preferred the overall speed and simplicity of Chrome that I simply haven't bothered to go back.

Compared to IE, developing for both platforms rarely requires you to even check Firefox for correctness or performance once you get around the quirks or use more recently developed JS libraries.

I think the only extension I installed for Chrome was TamperMonkey. And a couple of things developed for work purposes.

That's what I do. I use chrome for a lot of stuff, but if I'm browsing video or or doing web development stuff I use FF.

And people here have told me that I'd like the Chrome dev tools better, but although I tried I was too lazy to completely switch so I just use FF and Firebug.