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

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

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

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.