Examine source code of Twitch Follower Count

{
  "name": "Twitch Follower Count",
  "version": "1.0.0",
  "description": "Configurable Firefox extension that shows follower count when in a twitch channel page.",
  "icons": {
    "16": "res/twitch-follower-count-icon-16x16.png",
    "32": "res/twitch-follower-count-icon-32x32.png",
    "48": "res/twitch-follower-count-icon-48x48.png",
    "64": "res/twitch-follower-count-icon-64x64.png",
    "128": "res/twitch-follower-count-icon-128x128.png"
  },
  "options_ui": {
    "page": "options/index.html"
  },
  "permissions": [
    "storage",
    "tabs",
    "http://*.twitch.tv/*",
    "https://*.twitch.tv/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "http://*.twitch.tv/*",
        "https://*.twitch.tv/*"
      ],
      "js": [
        "twitch-follower-count.user.js"
      ],
      "css": [
        "twitch-follower-count.css"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "aranciro@protonmail.com",
      "strict_min_version": "42.0"
    }
  },
  "manifest_version": 2
}