Ah, that reminds me of how I modified sites using https://www.proxomitron.info/ https://www.proxomitron.info/ , it's a Windows program that would start a local

Ah, that reminds me of how I modified sites using https://www.proxomitron.info/ https://www.proxomitron.info/ , it's a Windows program that would start a local HTTP proxy and you can configure browsers to use this proxy, and it would block ads. This worked really well before the web became HTTPS-crazy. The way it would block ads is to analyze the files it was fetching for the browser and modifying found keywords, for a crude example all IMG tags with SRC containing the string ad.* would be replaced by gray images. I also remember using it to "fix" a redesign of a site.