Examine source code of Deadline Tracker

{
  "manifest_version": 2,
  "name": "Deadline Tracker",
  "version": "1.0",
  "description": "Keep track of your important deadlines and view the remaining time to stay on schedule.",
  "icons": {
    "48": "icons/deadline-tracker-icon-48.png"
  },
  "permissions": [],
  "browser_action": {
    "default_icon": "icons/deadline-tracker-icon-48.png",
    "default_popup": "popup.html",
    "default_title": "Deadline Tracker"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{07caf1a0-9dc5-46b6-b131-6d5e31d35b7e}"
    }
  }
}