IE11 has problems with JS

[kasvith]

Steps to reproduce the issue

• Just open the NMM in IE11

Expected result

• A working NMM

Actual result

• A broken NMM

System information (as much as possible)

• Windows 10
• IE 11

Additional comments

These are the errors possibly shown in the console of IE11 with stack

• Object doesn't support property or method 'startsWith'

"TypeError: Object doesn't support property or method 'startsWith' at Anonymous function (http://localhost/media-manager-improvement/media/com_media/js/mediamanager.min.js:6:73955) at Anonymous function (http://localhost/media-manager-improvement/media/com_media/js/mediamanager.min.js:6:73926) at e.default.methods.findDrive (http://localhost/media-manager-improvement/media/com_media/js/mediamanager.min.js:6:73875) at e.default.computed.crumbs (http://localhost/media-manager-improvement/media/com_media/js/mediamanager.min.js:6:73513) at ba.prototype.get (http://localhost/media-manager-improvement/media/com_media/js/mediamanager.min.js:6:5648) at ba.prototype.evaluate (http://localhost/media-manager-improvement/media/com_media/js/mediamanager.min.js:6:6638) at Anonymous function (http://localhost/media-manager-improvement/media/com_media/js/mediamanager.min.js:1:19440) at t.exports.render (http://localhost/media-manager-improvement/media/com_media/js/mediamanager.min.js:6:74113) at t.p"

• 'Promise' is undefined

"ReferenceError: 'Promise' is undefined at Anonymous function (http://localhost/media-manager-improvement/media/com_media/js/mediamanager.min.js:6:114084) at T.prototype.dispatch (http://localhost/media-manager-improvement/media/com_media/js/mediamanager.min.js:11:3396) at dispatch (http://localhost/media-manager-improvement/media/com_media/js/mediamanager.min.js:11:2716) at e.default.mounted (http://localhost/media-manager-improvement/media/com_media/js/mediamanager.min.js:6:56232) at jt (http://localhost/media-manager-improvement/media/com_media/js/mediamanager.min.js:1:17430) at wa.insert (http://localhost/media-manager-improvement/media/com_media/js/mediamanager.min.js:6:7449) at S (http://localhost/media-manager-improvement/media/com_media/js/mediamanager.min.js:6:20092) at Anonymous function (http://localhost/media-manager-improvement/media/com_media/js/mediamanager.min.js:6:21570) at t.prototype._update (http://localhost/media-manager-improvement/media/com_media/js/mediamanager"

• Object doesn't support property or method 'find'

"TypeError: Object doesn't support property or method 'find' at i (http://localhost/media-manager-improvement/media/com_media/js/mediamanager.min.js:11:14767) at Anonymous function (http://localhost/media-manager-improvement/media/com_media/js/mediamanager.min.js:11:15480) at Anonymous function (http://localhost/media-manager-improvement/media/com_media/js/mediamanager.min.js:11:15446) at Anonymous function (http://localhost/media-manager-improvement/media/com_media/js/mediamanager.min.js:6:113857) at Anonymous function (http://localhost/media-manager-improvement/media/com_media/js/mediamanager.min.js:11:3204) at Anonymous function (http://localhost/media-manager-improvement/media/com_media/js/mediamanager.min.js:11:3182) at T.prototype._withCommit (http://localhost/media-manager-improvement/media/com_media/js/mediamanager.min.js:11:4447) at T.prototype.commit (http://localhost/media-manager-improvement/media/com_media/js/mediamanager.min.js:11:3154) at commit (http://localhost/media"