Examine source code of Tab Planner

{
  "description": "Allows you to sort and group tabs.",
  "manifest_version": 2,
  "name": "Tab Planner",
  "version": "1.3.0",
  "permissions": [
    "tabs",
    "tabHide",
    "sessions",
    "storage",
    "menus"
  ],
  "optional_permissions": [],
  "icons": {
    "16": "icons/icon_plain.svg",
    "24": "icons/icon_plain.svg",
    "32": "icons/icon_plain.svg",
    "48": "icons/icon_plain.svg",
    "64": "icons/icon_plain.svg",
    "96": "icons/icon_plain.svg",
    "128": "icons/icon_plain.svg"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "planner@leopoldek.com",
      "strict_min_version": "78.0"
    }
  },
  "background": {
    "page": "background.html",
    "persistent": false
  },
  "browser_action": {
    "default_icon": "icons/icon_plain.svg",
    "default_title": "Tab Planner",
    "default_popup": "popup/planner_view.html",
    "default_area": "navbar"
  },
  "options_ui": {
    "page": "options/options.html",
    "browser_style": true
  }
}