I fully understand your comments, however the service should not be locked (granted indirectly based on your reply) to a browser, and neither should customers of ancestry be expected to add plugins that bloat the browser.
As a web developer and programmer for over 15 years, I would have to doubt Firefox faster claims, likewise Mozilla seem rather lazy of late with fixing bugs promptly, but that's a convo for a generic forum ;)
PS: Please don't take this as a direct attack at your Mike, far from it.