Examine source code of Open End

{
  "manifest_version": 2,
  "name": "Open End",
  "version": "0.5.1",
  "version_name": "0.5.1 (BETA)",
  "default_locale": "en",
  "description": "__MSG_manifest_description__",
  "icons": {
    "16": "img/icon_twitch-purple_16.png",
    "32": "img/icon_twitch-purple_32.png",
    "64": "img/icon_twitch-purple_64.png",
    "128": "img/icon_twitch-purple_128.png"
  },
  "author": "snowwits@gmail.com",
  "homepage_url": "https://github.com/snowwits/openend",
  "background": {
    "scripts": [
      "common/common.js",
      "background/background.js"
    ],
    "persistent": false
  },
  "browser_action": {
    "default_icon": {
      "16": "img/icon_grey_16.png",
      "32": "img/icon_grey_32.png",
      "64": "img/icon_grey_64.png",
      "128": "img/icon_grey_128.png"
    },
    "default_popup": "popup/popup.html"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.twitch.tv/*"
      ],
      "css": [
        "common/common.css",
        "content_scripts/twitch.tv.css"
      ],
      "js": [
        "common/common.js",
        "content_scripts/twitch.tv.js"
      ],
      "run_at": "document_end"
    },
    {
      "matches": [
        "*://*.mlg.com/*",
        "*://*.majorleaguegaming.com/*",
        "*://*.overwatchleague.com/*"
      ],
      "all_frames": true,
      "css": [
        "common/common.css",
        "content_scripts/mlg.com.css"
      ],
      "js": [
        "common/common.js",
        "content_scripts/mlg.com.js"
      ],
      "run_at": "document_end"
    }
  ],
  "options_ui": {
    "page": "options/options.html",
    "browser_style": true,
    "chrome_style": true
  },
  "permissions": [
    "storage",
    "tabs"
  ],
  "web_accessible_resources": [
    "img/*",
    "options/options.html"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "openend@snowwits.github.com"
    }
  },
  "minimum_chrome_version": "58.0"
}