Regardless of which browser you used for development, wouldn't you need to test with every browser that your product supports? Even with modern browsers, browser-specific problems are unfortunately quite common.

Yes of course, I meant testing cycle while you develop. After that all browsers before releasing.

Since I run Browserling (a cross-browser testing company), I test in all the browsers. :) Before I start testing, I use Chrome to get it done.

Chrome because of the development tools.

Yeah I agree. I think it's a very personal preference thing though, but I definitely find the Chrome dev tools more intuitive than Firefox.