Intent to Ship: Block HTTP(s) requests to SIP ports 5060, 5061

Hi, Summary: Adding ports 5060,5061 to the existing list of blocked ports The intent for this block is to stop the specific attack of "NAT slipstreaming". We acknowledge that this stops an instance of the attack rather than solving the problem, which will happen later. Bug: 1674735 Standard:

Intent to ship: PerformancePaintTiming API

/Summary: /PerformancePaintTiming API allows developers to measure the paint timing metric for their websites during pageload. /Bug/: 1518999 /Standard/: https://w3c.github.io/paint-timing/. There are two timing entries defined in spec (`first-pai