Firefox doesn't sync and admin panel not work

[Mitiryl]

Issue details

Hi,

We are using BrowserSync in proxy mode and with chrome all is working fine. But on firefox we are not able to sync the page with the other browsers and also the admin panel seems not working (the lateral menu is shown but there is no content on the right part of the page, only white space).

Thank you in advance!

Please specify which version of Browsersync, node and npm you're running

• Browsersync [ 2.11.2 ]
• Node [ 0.10.25 ]
• Npm [ 3.8.5 ]

  Affected platforms

• [x] linux
• [ ] windows
• [ ] OS X
• [ ] freebsd
• [ ] solaris
• [ ] other (please specify which)

  Browsersync use-case

• [ ] API
• [x] Gulp
• [ ] Grunt
• [ ] CLI

  for all other use-cases, (gulp, grunt etc), please show us exactly how you're using Browsersync

gulp.task('browser-sync', function () {
    var browserSync = require('browser-sync').create();
    browserSync.init({
        proxy: {
            target: "https://localhost:8443",
            ws: true
        },
        browser: ["google-chrome","firefox"],
        reloadOnRestart: false
    });
    gulp.watch("./webapp/styles/**/*.scss", ['sass']);
    gulp.watch("./webapp/**/*.html").on('change', browserSync.reload);

 });

[JosephScript]

I confirmed this is the same on OS X with FF Developer Edition.