Examine source code of TabsURLs

{
  "manifest_version": 2,
  "name": "TabsURLs",
  "version": "1.0",
  "description": "Extracts URLs from tabs.",
  "icons": {
    "48": "icons/icon-light.svg"
  },
  "permissions": [
    "tabs",
    "clipboardWrite"
  ],
  "web_accessible_resources": [
    "icons/*.*"
  ],
  "browser_action": {
    "browser_style": true,
    "default_icon": "icons/icon-dark.svg",
    "theme_icons": [
      {
        "light": "icons/icon-light.svg",
        "dark": "icons/icon-dark.svg",
        "size": 32
      }
    ],
    "default_title": "TabsURLs",
    "default_popup": "popup/menu.html"
  }
}