[rebelwebmaster]

Firefox ESR updates on the same frequency as the mainline release, they're just more limited in scope (i.e. mostly just security & stability fixes).

[Wowfunhappy]

They should be smaller downloads that install more quickly though, shouldn't they?

I'm not on Firefox ESR, but switching to Windows LTSC made Windows updates a lot less painful and less noticeable, even though technically the frequency is the same.