Google has announced that it is cutting off access to the Sync and “other Google Exclusive” APIs from all builds except Google Chrome.

[…] They’re not closing a security hole, they’re just requiring that everyone use Chrome.

Or to put it bluntly, they do not want you to access their Google API functionality without using proprietary software (Google Chrome). There is no good reason for Google to do this, other than to force people to use Chrome.

More info (Google’s shitty explanation/justification): https://groups.google.com/a/chromium.org/g/chromium-packagers/c/SG6jnsP4pWM (Mirror)