Examine source code of ChronoSheets

{
  "manifest_version": 2,
  "name": "ChronoSheets",
  "version": "20.0.0",
  "description": "Simple companion app for ChronoSheets timesheets",
  "homepage_url": "https://www.chronosheets.com",
  "icons": {
    "48": "csmainlogocircle-48.png",
    "96": "csmainlogocircle-96.png"
  },
  "browser_action": {
    "default_icon": "csmainlogocircle-96.png",
    "default_title": "ChronoSheets",
    "default_popup": "index.html"
  },
  "permissions": [
    "*://api.chronosheets.com/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{e115d630-3a50-4869-b2bc-ca11bb1c3048}"
    }
  }
}