I keep hearing many complaints on how Mozilla is moving too fast with the Firefox updates with Rapid Release. I have said time and time again, that nothing has changed, other than the numbering. Mozilla was releasing updates every six weeks even before Rapid Release. Consider this Mozilla Firefox 1.0 was released in November 2004 and version 10.0 was released at the end of January and Google Chrome was first released on September 2008 and just released version 17.0.963.56 a few days ago (complete release history).
The amount of releases are fairly similar, but based on how people interpret the numbering, it looks like there has been more Chrome release than Firefox. Of course, most Chrome users have no idea what version they are running without going into Help > About Google Chrome. The reason for this is Chrome updates itself automatically and silently (unless the user opts out) when the user starts it up each time.
Then there is Internet Exploiter that Microsoft took 5 years to move from version 6 to 7 and still crawling with a new version about every 18 to 24-months. But to be fair, Microsoft includes security and stability updates in the form of a Windows Update while keeping the current version number. Where as Firefox and Chrome bump the version numbers on each update. Just some food for thought.