Chrome SafeBrowsing engineer here. Google has published the protocol that clients need to follow to fetch updates from the SafeBrowsing servers here: https://d

Chrome SafeBrowsing engineer here. Google has published the protocol that clients need to follow to fetch updates from the SafeBrowsing servers here: https://developers.google.com/safe-browsing/developers_guide_v3#ProtocolBasics https://developers.google.com/safe-browsing/developers_guide... Both Chrome and Firefox implement that protocol. I believe Edge uses Microsoft's own service. Not sure about Opera.