Comment by archargelod

> accounts.google.com/gsi/*

This filter might break functionality on some sites, so it's better to use more specified version:

  ||accounts.google.com/gsi/*$xhr,3p

Explanation of the relevant syntax:

  `[no prefix]`: Blocks resources that have this text string anywhere in its URL.
  `||`: Blocks resources that have a specific domain or subdomain.
  `$3p`: Ensures that resources from a domain are only blocked if you're not visiting the domain itself.
  `$xhr`: Prevents such resources from being downloaded through the titular JavaScript APIs.

More Ad-filtering syntax explained: https://github.com/DandelionSprout/adfilt/blob/master/Wiki/S...