With chrome (and now firefox?) you kind of are obliged to update... Right? Due to their update scheme I've at least gotten the impression that they won't fix security issues in older versions, but I could be wrong.
Firefox has a little middle ground where you can use specific versions outside of the fast release cycle and still get security updates. At least that's the plan. https://wiki.mozilla.org/Enterprise/Firefox/ExtendedSupport:... You don't get the 10 years of support that MSFT might provide for (some) versions of IE, but it's not like you have to upgrade every 6 weeks either. Also, because Firefox is open source, they're hoping that someone else will pick up the slack and continue to support older versions.
I haven't heard of any similar program from Chrome.
With chrome (and now firefox?) you kind of are obliged to update... Right? Due to their update scheme I've at least gotten the impression that they won't fix security issues in older versions, but I could be wrong.