Examine source code of TriGearLab

{
  "name": "TriGearLab",
  "description": "Addon allows opening triathlon news, training hints and tips on TriGearLab website",
  "version": "1.0",
  "manifest_version": 2,
  "icons": {
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png"
  },
  "applications": {
    "gecko": {
      "id": "fromya@gmail.com",
      "strict_min_version": "55.0"
    }
  },
  "browser_action": {
    "default_icon": "icons/icon-48.png",
    "default_title": "TriGearlab Triathlon Gear, Training and Tips"
  },
  "background": {
    "scripts": [
      "siteopen.js"
    ]
  }
}