> personally I don't want some random third-party having the ability to exfiltrate my google cookie via an auto-updating extension

Driven by the same motivation, I've first adapted a userscript [1], but later replaced it with simple uBlock Origin filters:

  google.*##.g:has(a[href*=".w3schools.com"])

[1] https://github.com/darekkay/config-files/blob/master/userscr...