Examine source code of centratus bookmarks

{
  "manifest_version": 2,
  "name": "centratus bookmarks",
  "version": "1.0.5",
  "author": "centratus",
  "homepage_url": "https://www.centrat.us/",
  "description": "saves bookmarks on centratus",
  "icons": {
    "16": "icons/centratus-icon-light-16.png",
    "32": "icons/centratus-icon-light-32.png",
    "64": "icons/centratus-icon-light-64.png",
    "128": "icons/centratus-icon-light-128.png"
  },
  "permissions": [
    "activeTab"
  ],
  "browser_action": {
    "default_icon": {
      "16": "icons/centratus-icon-light-16.png",
      "32": "icons/centratus-icon-light-32.png"
    },
    "default_title": "centratus",
    "default_popup": "popup/popup.html"
  }
}