Examine source code of Imagus

{
  "manifest_version": 2,
  "default_locale": "en",
  "update_url": "https://clients2.google.com/service/update2/crx",
  "version": "0.9.8.74",
  "name": "Imagus",
  "description": "__MSG_APP_DESCRIPTION__",
  "homepage_url": "https://www.reddit.com/r/Imagus",
  "author": "Deathamns",
  "icons": {
    "128": "icon.png"
  },
  "permissions": [
    "*://*/*",
    "downloads",
    "history",
    "storage"
  ],
  "background": {
    "page": "background.html",
    "persistent": true
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "includes/app.js"
      ],
      "run_at": "document_start",
      "all_frames": true
    },
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "includes/content.js"
      ],
      "run_at": "document_end",
      "all_frames": true
    },
    {
      "matches": [
        "https://*/search*"
      ],
      "include_globs": [
        "https://www.google.*/search*"
      ],
      "js": [
        "js/sp_gim.js"
      ],
      "run_at": "document_idle"
    },
    {
      "matches": [
        "https://duckduckgo.com/*"
      ],
      "css": [
        "css/sp_ddg.css"
      ]
    }
  ]
}