What is going on with browsers (and other software) is weird. There is no support window on the product beyond "until we get you the next versions. Upgrades are free, and you normally don't even notice when we upgrade. Also the old version is significantly less secure then it was a month ago, even though it hasn't changed at all."
Nothing about this situation is intuitive to a non expert.
Even as a proffesional, I find it supprising that we do not see any LTS browsers given that they are essentially self contained operating systems.