I thought you were joking about Firefox 7. From version 4 to 7 in one year, are you kidding? It turns out you're right. For some reasons, I really dislike software companies jack up version numbers: how can you have FOUR MAJOR releases within one year for a relatively complex software? That gives me an impression that they feel insecure of becoming irrelevant, instead of competing on features and usability, they choose to compete on version numbers.
I could be wrong, but I just don't feel like they fall into the same trap Netscape did a decade ago.
I could care less, but companies have done it several times.
Netscape skipped version 5 (a doomed project).
Microsoft ditched version numbers for years (95, 98, 2000), and then just names -- due to how version number increments on an existing product appear to end users.
To technically savvy it doesnt really matter "is it 5.0 or 4.5?"
But the version number or name is about trying to position the product as a "new one" or even just "mature" to the more typical end user.
I don't want to be "that guy" and I'm not trying to be a grammar Nazi. I know this is now an idiom in the USA, and therefore it doesn't have to make sense.
However ...
I've now heard it said, in four different countries, that this phrase makes the speaker sound like an idiot. I know it's now just "the norm" in the USA, but I wanted to let people here know that saying this makes a bad impression.
If you don't care how you sound to non USAians then don't bother. But if you're wondering what I'm talking about, David Mitchell does an excellent job of explaining "I couldn't care less"