Examine source code of One-Click Task

{
  "manifest_version": 2,
  "name": "One-Click Task",
  "version": "1.0",
  "description": "Instantly create a new task with a link to the current page.",
  "icons": {
    "48": "icon.png"
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "icon.png"
  },
  "permissions": [
    "activeTab",
    "storage",
    "notifications"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{a1b5e828-aa1d-4930-9060-de2b37a84df6}"
    }
  }
}