This is pretty crappy. What is the rendering difference of 5 to 8? How many versions am I as a web developer going to have to support. short dev cycles and fast releases like this are stupid.
Mozilla has moved away from the typical versioning system to one where major x.0 releases are shipped much more frequently per their rapid release development cycle [1] [2]. So even if there are no "major" changes you will see a new x.0 release. This shouldn't cause developers any major problems. Well, unless, for example, someone is using shoddy user agent detection scripts, the consequences which Opera experienced when it released version 10; turns out some scripts aren't designed to handle two-digit version numbers [3] ಠ_ಠ
