Firefox has some catches that make it not as easy to use in a work environment though and I honestly think will hurt their market share over time, mainly the fact that it doesn't use the OS cert store. This causes issues with most corporate web proxies that do SSL inspection since IT departments will push the proxy CA cert into OS cert stores through whatever endpoint management solution they have.
People can disagree all they want about SSL interception in a corporate environment (for good reason), but it's here to stay. When a corporate user downloads Firefox, tries to simply go to Google and gets a cert error page, they're just going to go back to Chrome because the process of exporting your company's CA cert and then importing it into Firefox so you can use the browser is just simply not feasible for most users.