[ComputerGuru]

Is that 45 MiB per-tab? People are laughing it off, but since each tab is a process these days..

[mccr8]

Each tab can be a dozen or more processes nowadays, thanks to site isolation.

[goku12]

Those may be forked copies of the main adblocker process. If so, you'll get the benefit of CoW page deduplication.

[ComputerGuru]

Windows (sanely) doesn’t do fork.

Shared memory obviously exists, though and they do mention in the post (missed it first time around) that they try to share Adblock resources.