Examine source code of Palnetify

{
  "manifest_version": 2,
  "name": "Palnetify",
  "version": "1.0",
  "description": "Adds a toolbar button to redirect users from steemit.com to palnet.io",
  "homepage_url": "https://www.palnet.io/palnet/@ausbitbank/palnetify-easily-switch-to-palnet-io-from-other-steem-ui-s",
  "icons": {
    "16": "icons/16x16.png",
    "32": "icons/32x32.png",
    "48": "icons/48x48.png"
  },
  "permissions": [
    "activeTab"
  ],
  "background": {
    "scripts": [
      "palnetify.js"
    ]
  },
  "browser_action": {
    "default_icon": {
      "16": "icons/16x16.png",
      "32": "icons/32x32.png",
      "48": "icons/48x48.png"
    }
  }
}