It's not the same thing. How is Firefox 7 version called then? What about 6? Does Firefox have 4 modes instead of 3, like Chrome (dev, beta, stable)? Firefox's "dev" mode might be equivalent to "Chromium" mode for Chrome, in which case I suppose Chrome also has 4 modes, but their dev modes are still not equal to each other.
The point was that Chrome 13 will become stable in 2-3 weeks from now (an Chrome 14 - beta), and then in another 6 weeks Chrome 14 will become stable. While Firefox 6 will become stable in 3-4 weeks, then another 6 weeks for FF 7, and then another 6 weeks for FF8, before it becomes stable. You do the math.
The point was that Chrome 13 will become stable in 2-3 weeks from now (an Chrome 14 - beta), and then in another 6 weeks Chrome 14 will become stable. While Firefox 6 will become stable in 3-4 weeks, then another 6 weeks for FF 7, and then another 6 weeks for FF8, before it becomes stable. You do the math.