Examine source code of Tab URL Harvester

{
  "manifest_version": 2,
  "name": "Tab URL Harvester",
  "version": "3.0",
  "homepage_url": "https://github.com/MoofyWoofy/tab-URL-harvester",
  "description": "Copies open tab URL to clipboard.",
  "permissions": [
    "tabs",
    "clipboardWrite",
    "bookmarks",
    "storage"
  ],
  "icons": {
    "48": "/assets/icon.jpg"
  },
  "options_ui": {
    "page": "/options/options.html"
  },
  "browser_action": {
    "default_icon": "/assets/icon.jpg",
    "default_popup": "/popup/popup.html",
    "default_title": "Tab URL Harvester"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{7d8fc02b-0f8a-44a8-b4ec-7abd0984520d}"
    }
  }
}