Trial and error. I got a list of Google's IP ranges (using something like the technique in [1]) and input them into the app layer firewall and tried browsing us

Trial and error. I got a list of Google's IP ranges (using something like the technique in [1]) and input them into the app layer firewall and tried browsing using Chrome and nothing broke, but that's because when I use Chrome I don't browse to any Google sites. I use uMatrix on my main browser and I'm well used to breaking sites, I suppose it's increased my patience for refreshing pages until I find the magic minimum for them to work. I almost always have to turn off all kinds of blocking when doing a payment though, especially anything involving redirects, like plane tickets. Javascript is the biggest pain, IMO, next would be sites that use Recaptcha. [1] https://snurps.blogspot.com/2013/10/how-many-ip-addresses-does-google-have.html https://snurps.blogspot.com/2013/10/how-many-ip-addresses-do...