> > > It might be easier than you think. ESR is the tough case, but most of > > our active users are on recent versions of Firefox. > > My instinct is to be incredibly conservative when breaking behaviour > that old Firefoxen depend on, but I've never really had to quantify it. > What should our definition of "sufficiently low usage" be that would > let us consider disabling the assertion endpoints entirely? >
This might be obvious, but it probably bears repeating that it's not just quantity of affected users but also the impact on those users. If we display a nice update prompt, then fine; if we silently spew errors into the log and just stop syncing, then that changes the equation somewhat. (And if we know the distribution of # of clients for each version, perhaps that helps — if most of our ancient-version users have only one device, perhaps we care less about breaking them.)
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