This talk was given at UIKonf 2016 in Berlin on 23rd May. The talk is about the challenges that Mozilla face trying to make Firefox on the iOS platform
The only exception to the foregoing is scripts and code downloaded and run by Apple's Built in WebKit framework or JavascriptCore” http://adcdownload.apple.com/Documentation/License_Agreements__Apple_Developer_Program/Apple_Developer_Program_Agreement_20150909.pdf Section 3.3.2