Honestly I don't have an issue with Firefox/Chrome for the rapid version number increases. A browser is the most updated (or should be) bit of software on your computer. Honestly I don't even think of the version of Firefox or Chrome these days. They are just "Firefox" and "Chrome". This is much better for general users IMHO as it just means they use "Firefox" and not "Firefox 4.1.2" or whatever. A consistent update schedule makes a public version number pointless and it has, at least in my experience, made extension developers better at building extensions that don't break because I have upgraded from version 15 to 16 like we had back in the Firefox v2/3/4 years.

At the end of the day when the version number isn't really known to the end user it makes little difference if you bump up the major version number or the minor.

Also I love how quickly we get new features now. Firefox has improved more in the past year than it did in the past several years before the shift to a 6 week release cycle. It isn't suited to all software I admit but for a browser it is perfect. None of this "This site only works with Firefox XX or Chrome XX". Thank god!