Examine source code of Copy Selected Tab URL

{
  "manifest_version": 2,
  "name": "Copy Selected Tab Info",
  "description": "Copies the URLs of the currently selected tabs to clipboard",
  "version": "0.0.3",
  "icons": {
    "64": "icons/copy-selected-tab-info-ICON-64x64.png"
  },
  "permissions": [
    "tabs",
    "contextMenus",
    "clipboardWrite"
  ],
  "background": {
    "scripts": [
      "background_script.js"
    ]
  },
  "content_scripts": [],
  "browser_action": {
    "default_icon": {
      "64": "icons/copy-selected-tab-info-ICON-64x64.png"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{4b867930-53b8-4681-94b6-759d0c5ef31f}"
    }
  }
}