User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:33.0) Gecko/20100101 Firefox/33.0 Build ID: 20150312030248 Steps to reproduce: I opened http://www.tape.tv/taylor-swift/videos/shake-it-off in my Firefox Nightly with Shumway 0.10.266. Actual results: The loading circle never finished spinning, no video was played. No obvious error in the console: Load Shared Dependencies: 10.36ms Load GFX Dependencies: 2.85ms TypeError: asm.js type error: Disabled by debugger Load Shared Dependencies: 10.37ms Load AVM2 Dependencies: 213.97ms Load SWF Parser: 0.50ms Load Flash TS Dependencies: 12.75ms Load AVM1 Dependencies: 12.15ms Load Player Dependencies: 253.82ms url=http://www.tape.tv/tapePlayer.swf;params=({}) viewerWrapper.js (line 54) Compiler settings: {"appCompiler":true,"sysCompiler":false,"verifier":true} Parsing http://www.tape.tv/tapePlayer.swf... Execute builtin.abc: 36.27ms Session #1: loading http://www.tape.tv/tapePlayer.swf mutating the [[Prototype]] of an object will cause your code to run very slowly; instead create the object with the correct initial [[Prototype]] value using Object.create this.__proto__ = E.prototype; shumway.player.js (line 11015, col 10) <System> Session #1: loaded 124052/124052 ShumwayCom.jsm (line 201) SWF load time: 0.0120sec ShumwayCom.jsm (line 201) Session #1: closed Expected results: the music video should have started to play