Since this has come up a couple times, I'm documenting this a little bit
more broadly here.
Use counters from before Firefox 118 are lower than they should. This is
because we were counting some very common about:blank pages as top level
loads which skew the data towards counters not being hit[1].
So when looking at use counter data from before that, be aware that a
counter of e.g. 0.25% could be much higher than it looks. It's hard to
put a concrete multiplier, but something like 2/3x higher seems about right.
Depending on what you want the data for, the data might still be useful,
tho. E.g, a zero counter is still zero etc.
Also note that some of the older data while available in places like [2]
doesn't seem to be always available on GLAM. I've asked around if that's
intentional.
Thanks,
-- Emilio
[1]: https://bugzilla.mozilla.org/show_bug.cgi?id=1845779
[2]: https://mozilla.github.io/usecounters/
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