Examine source code of OneClickUrl2Clipboard

{
  "manifest_version": 2,
  "name": "Link2Clipboard",
  "short_name": "Link2Clipboard",
  "description": "Copy the url with one click!",
  "version": "1.0",
  "author": "ProWebJect - Michal Gora",
  "icons": {
    "19": "img/icon_19.png",
    "38": "img/icon_38.png",
    "128": "img/icon_128.png"
  },
  "browser_action": {
    "default_icon": {
      "19": "img/icon_19.png",
      "38": "img/icon_38.png",
      "128": "img/icon_128.png"
    },
    "default_title": "Copy this url!"
  },
  "permissions": [
    "tabs",
    "clipboardWrite"
  ],
  "background": {
    "page": "/background/background.html"
  }
}