As a proxy extension developer, this is absolutely maddening. We're forced to choose between auth-less open proxies (bad), or baking in a wacky authentication scheme through a side channel (also bad). MV3 drops in 2.5 months, and will leave tens of millions of proxy extension users unable to use products they paid money for.
This is all on top of the many other issues with MV3 that Google is pushing under the guise of "improving performance".
This is all on top of the many other issues with MV3 that Google is pushing under the guise of "improving performance".