Examine source code of Old Mix Extension

{
  "name": "Old Mix Extension",
  "short_name": "Old Mix Extension",
  "homepage_url": "https://mix.com",
  "version": "1.1.10",
  "manifest_version": 2,
  "description": "Mix is a new way to discover and curate interesting things you find on the internet.",
  "icons": {
    "16": "img/mix_icon_16.png",
    "38": "img/mix_icon.png",
    "48": "img/mix_icon_48.png",
    "128": "img/mix_icon_128.png"
  },
  "browser_action": {
    "default_icon": {
      "16": "img/mix_icon_16.png",
      "38": "img/mix_icon.png",
      "48": "img/mix_icon_48.png",
      "128": "img/mix_icon_128.png"
    },
    "default_title": "Old Mix Extension",
    "default_popup": "index.html#"
  },
  "background": {
    "page": "background.html",
    "persistent": true
  },
  "content_scripts": [
    {
      "matches": [
        "*://mix.com/**"
      ],
      "js": [
        "js/config.js",
        "js/utils.js",
        "js/mix.com.content.script.js"
      ],
      "all_frames": true,
      "run_at": "document_start"
    }
  ],
  "permissions": [
    "activeTab",
    "cookies",
    "*://mix.com/*"
  ],
  "web_accessible_resources": [
    "close.html"
  ],
  "applications": {
    "gecko": {
      "id": "@mix-firefox-extension"
    }
  }
}