@bmacDonald94 @bruce A lot of webdevs use CDNs from google to distribute stuff like jquery and what not else frontend stuff.
If you want to specifically block the sign-in related stuff leading to google I'd recommend blocking something like accounts.google.com .
You can do this by adding it to your hosts file (/etc/hosts on mac/linux, C:\Windows\System32\drivers\etc\hosts on Windows), looking something like this:
127.0.0.1 accounts.google.com
it'll remap the domain to localhost, blocking it.