Some Safari ad blocker that I had installed years ago and that went to the dark side since was inserting 400KB of spam in the outbound e-mails that I was writing inside a popular webmail client. 😳
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Apparently it was a bug and the malicious URLs were there to be filtered. I think i'll still go back to a DNS-based solution, it's rustic but more reliable. issues.adblockplus.org/ticket/369
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Use Safari's content blocker support rather than a legacy extension via something like apps.apple.com/app/adguard-fo. Content blockers pass a declarative set of rules to the browser and the browser enforces them using a far more efficient and robust native content filtering engine.
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You don't want to know the journey that this tweet caused, but here I am. Thanks for the recommendation.