6.6 pkg_add of firefox vs atk versions

Probably got my packages messed up at some point, and should just stop
doing endless "upgrades", and start clean with 6.7, but for learning
purposes and perspective, would appreciate tips on why doing a pkg_add of
firefox under 6.6 would fail, while looking for a version of atk that that
is not in the packages for 6.6?


farm# pkg_add firefox
quirks-3.187 signed on 2020-05-19T14:41:48Z
Can't install firefox-72.0.2 because of libraries
|library atk-1.0.21809.3 not found
...

But looking at:

https://ftp.openbsd.org/pub/OpenBSD/6.6/packages/amd64/

I only see: atk-2.... and no atk-1....

-------------------------- <clip> ----------------------
at-spi2-core-2.32.1.tgz 12-Oct-2019 06:06 258681
atari800-4.1.0.tgz 12-Oct-2019 06:06 408617
atf-0.18p3.tgz 12-Oct-2019 06:06 1129085
atk-2.32.0.tgz 12-Oct-2019 06:06 461597
atk2mm-2.28.0.tgz 12-Oct-2019 06:06 1238387
atlas-0.4.3.1p10.tgz 12-Oct-2019 06:06 2360270
atomicparsley-0.9.6p3.tgz 12-Oct-2019 06:06 138835
--------------------------- </clip> -----------------------

I realize that there are dependencies of dependencies going on here. but
for perspective, why wouldn't atk-1... exist in the same package
repository as the 6.6 version of firefox does, if that version (or
probably it's other dependencies) requires it. Wouldn't package testing
have failed for firefox when it was tested for 6.6? And if not, why not?

Thanks in advance, for any comment.

Austin Hook