Fix JS Bin Embed font-size

fix-jsbin-embed.js

var fontSize = 20;
var style = document.createElement('style');
style.innerText = '#output li, #exec, .fakeInput, .fakeInput:before, #exec:before, #bin .editbox .CodeMirror, .mobile .editbox textarea{ font-size: ' + fontSize + 'px !important; }';
document.head.append(style);

manifest.json

{
  "name": "Fix JS Bin Embed font-size",
  "description": "Set font-size in JS Bin embed",
  "version": "0.1",
  "icons": {
      "64": "favicon.png"
  },
  "content_scripts": [
    {
      "matches": ["*://jsbin.com/*embed*"],
      "js": ["fix-jsbin-embed.js"],
      "all_frames": true
    }
  ],
  "manifest_version": 2
}