Examine source code of Pinner

{
  "name": "Pinner",
  "description": "Automatically pin & open specific tabs on startup",
  "version": "1.5.7",
  "manifest_version": 2,
  "author": "Indogermane",
  "icons": {
    "500": "icons/icon.svg"
  },
  "options_ui": {
    "page": "src/options/options.html"
  },
  "page_action": {
    "default_icon": "icons/Pin.png",
    "default_title": "Pin this domain automatically",
    "show_matches": [
      "<all_urls>"
    ]
  },
  "background": {
    "scripts": [
      "src/background/background.js"
    ]
  },
  "permissions": [
    "storage",
    "tabs"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "Pinner@Indogermane",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    },
    "gecko_android": {
      "strict_min_version": "142.0"
    }
  }
}