Examine source code of Ovulation Calculator

{
  "manifest_version": 2,
  "name": "Ovulation Calculator",
  "version": "1.0",
  "description": "Track your cycle and fertility with the ultimate ovulation tracking extension",
  "permissions": [],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "128": "images/ovu-logo.png"
    }
  },
  "icons": {
    "128": "images/ovu-logo.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{b36898e3-d2a4-46d1-bf9f-dc8c4e881374}"
    }
  }
}