On the flipside, a frequently updated browser that is constantly improving is a bit of a moving target. Because of the ease for them to push out updates, vulner

On the flipside, a frequently updated browser that is constantly improving is a bit of a moving target. Because of the ease for them to push out updates, vulnerabilities can be fixed and pushed out to the vast majority of users in short order. Malicious people may only get a few days/weeks to wreak havoc at a large scale, as the vast majority will have updated shortly after the problem is fixed. In Forefox's case, the frequent releases more have to do with rapid improvement and iteration than anything. Read the changelog and notice how it was largely a bunch of mid-moderate improvements. Some CSS goodies, some JS goodies, some security goodies.