Examine source code of Twitchls Redirect

{
  "manifest_version": 2,
  "name": "Twitchls Redirect",
  "version": "1.1",
  "description": "Automatically redirects Twitch streams to Twitchls when opening a Twitch stream directly or by pressing F5. It also adds a menu option and toolbar icon to manually redirect to Twitchls and change the Chat Theme.",
  "icons": {
    "48": "icons/icon48.png",
    "96": "icons/icon96.png"
  },
  "permissions": [
    "activeTab",
    "contextMenus"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://www.twitch.tv/*"
      ],
      "js": [
        "twitchtotwitchls.js"
      ]
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": "icons/icon48.png",
    "default_title": "Twitchls Redirect",
    "default_popup": "popup/popup.html"
  }
}