[citation][nom]Freiheit[/nom]Chrome is at version 11 and looks and feels almost identical to version 3. In that light, Firefox 5, 6 and 7 all being released this year with only minor tweaks make perfect sense. On the other hand, why not just call it Firefox 17 and be done with it?[/citation]
Chrome 11 is only superficially different in UI design (further evidence of a minimalist, uncluttered browser interface's usefulness), but it received several massive overhauls at a deeper level:
- The addition of an extension API
- Several revamped/from scratch JS engines
- Several major boosts in standards compliance
- The addition of new features like cloud printing or syncing.
In short, pretty much everything changed dramatically since launch, save for the UI (the options menu and options menu were tweaked and they adopted a grey rather than blue theme, but that's minor).
Even though Google numbers faster than justified, they never upped Chrome's number without at least a major under-the-hood update or new feature. FF 5.0 on the other hand offers absolutely nothing other than bugfixes and small tweaks.