[TIMOB-6388] MobileWeb: Deploy - Two extra empty browser windows are launched in Firefox on first run or page refresh

Two extra empty browser windows are launched in Firefox on first run or page refresh. The URLs are: https://api.appcelerator.net/p/v2/mobile-track?callback=html5_jsonp695648 https://api.appcelerator.net/p/v2/mobile-track?callback=html5_jsonp864800 Steps to Reproduce: 1. Open Studio, create default MobileWeb app. 2. Launch with Firefox (browser can be set in the Run Configurations menu). Expected Result: One new window should load in Firefox showing the content of the app. Actual Result: Three new windows open (the app and two extra URLs). The extra URLs also launch on page reload. Note: This behavior is consistent between operating systems. Only found behavior in Firefox. Screenshot and logs attached.