@bzbarsky @dakami and I had a hallway discussion at the end of TPAC about the possibility of adding location.ancestorOrigins to Firefox. bz has had longstanding concerns about the information this leaks to child frames. We arrived at a local consensus that any leakage is roughly equivalent to what happens already with referrer, so it would make sense to redact ancestorOrigins according to referrer policy. (and this could resolve that objection to a Mozilla implementation of ancestorOrigins)

/cc @smaug---- @annevk