Intermittent HPKP errors when checking for Tor Browser updates on Windows
There seems to be intermittent HPKP errors in the browser console on Windows which are related to our update checks. This got reported on our blog: https://blog.torproject.org/comment/276419#comment-276419.
As mentioned there as well one can see those errors quite frequently if one opens the About Tor Browser menu after start-up (which does the update check)