Examine source code of StreamBlend

{
  "manifest_version": 2,
  "name": "StreamBlend",
  "version": "1.14",
  "description": "Blends your follows from multiple sites into one list.",
  "icons": {
    "16": "images/16.png",
    "32": "images/32.png",
    "48": "images/48.png",
    "96": "images/96.png",
    "128": "images/128.png"
  },
  "permissions": [
    "storage",
    "*://*.mixer.com/*",
    "*://*.twitch.tv/*",
    "*://*.google.com/*",
    "*://*.googleapis.com/*",
    "*://*.youtube.com/*",
    "*://*.dlive.tv/*",
    "*://*.smashcast.tv/*"
  ],
  "options_ui": {
    "page": "options.html"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.twitch.tv/*"
      ],
      "js": [
        "contentTwitch.js"
      ]
    },
    {
      "matches": [
        "*://*.mixer.com/*"
      ],
      "css": [
        "contentMixer.css"
      ],
      "js": [
        "contentMixer.js"
      ]
    },
    {
      "matches": [
        "https://sites.google.com/site/streamblend/oauth"
      ],
      "js": [
        "oauth.js"
      ],
      "all_frames": true
    },
    {
      "matches": [
        "https://streamblend.github.io/oauth"
      ],
      "js": [
        "oauth.js"
      ],
      "all_frames": true
    }
  ],
  "browser_action": {
    "default_icon": {
      "16": "images/16.png",
      "32": "images/32.png",
      "48": "images/48.png",
      "96": "images/96.png",
      "128": "images/128.png"
    },
    "default_title": "StreamBlend",
    "default_popup": "popup.html"
  },
  "web_accessible_resources": [
    "images/*",
    "fonts/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{9c4f0f69-582d-4255-9ee6-f3ff8899bd18}",
      "strict_min_version": "57.0"
    }
  }
}