Does it seem like Mozilla is lowering the bar as to what will constitute an integer release (4.0, 5.0, etc.)? It was July 2008 when FireFox 3.0 came out, 19 months later, 4.0 hasn't come out yet.
No, it seems like they want to ship major releases more often and don't want to think hard about what version increment the new release's features merit.
Mozilla has been talking about faster iterations for a while now. 3.6 was, I think, supposed to be the start of that initiative; 3.5 was June 2009, and 3.6 was January 2010, even after slipping by a month or two.
You could argue that the platform version change from 1.9.1 to 1.9.2 isn't that big of a difference compared to the jump from 1.9.2 to 2.0, but you have to keep in mind that the decision to dub the-platform-behind-Firefox-4 as "Gecko 2" wasn't even made until over the summer.
