Examine source code of Forum Toolbox

{
  "manifest_version": 2,
  "name": "Forum Toolbox",
  "version": "3",
  "description": "Forum Toolbox",
  "icons": {
    "48": "icons/toolbox-icon.png"
  },
  "permissions": [
    "activeTab",
    "tabs",
    "downloads",
    "storage",
    "contextMenus",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background/md5.js",
      "background/background.js"
    ]
  },
  "sidebar_action": {
    "default_title": "Forum Toolbox",
    "default_panel": "sidebar/sidebar.html",
    "default_icon": "icons/toolbox-icon.png"
  }
}