Not working as TV richtext editor in Firefox 64.0 throwing NS_ERROR_UNEXPECTED: tiny_mce.js:1

[travisbotello]

After upgrading to Firefox to latest 64.0 TinyMCE is no longer working as richtext TV editor. The editor is displaying correctly but input is not working anymore. JS Console shows NS_ERROR_UNEXPECTED: tiny_mce.js:1

[Ihnatenko]

Hello.
I have such a problem
I use MODX package TinyMCE 4.3.4

This error in
/assets/components/tinymce/jscripts/tiny_mce/tiny_mce.js?v=265pl
on line 8514 if click to format the code.

l = o.ownerDocument.implementation;

This error look as this issue tinymce/tinymce#3113.

[travisbotello]

Use this package instead: https://modx.com/extras/package/tinymcerichtexteditor