Examine source code of Drup - Shared bookmarks for teams

{
  "name": "Drup - Shared bookmarks for teams",
  "version": "1.3.5",
  "description": "Save links in a group space with previews and search.",
  "icons": {
    "16": "images/drup_16.png",
    "32": "images/drup_32.png",
    "48": "images/drup_48.png",
    "128": "images/drup_128.png",
    "512": "images/drup_512.png",
    "1024": "images/drup_1024.png"
  },
  "permissions": [
    "activeTab",
    "bookmarks",
    "cookies",
    "https://app.getdrup.com/",
    "<all_urls>"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "images/drup_16.png",
      "32": "images/drup_32.png",
      "48": "images/drup_48.png",
      "128": "images/drup_128.png",
      "512": "images/drup_512.png",
      "1024": "images/drup_1024.png"
    }
  },
  "background": {
    "persistent": false,
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "https://app.getdrup.com/*"
      ],
      "js": [
        "content_script.js"
      ],
      "run_at": "document_start"
    }
  ],
  "manifest_version": 2
}