Examine source code of Tapto

{
  "manifest_version": 2,
  "version": "0.1",
  "name": "Tapto",
  "description": "Quickly save webpages to your Tapto account",
  "browser_specific_settings": {
    "gecko": {
      "id": "browser-extension@tapto.net"
    }
  },
  "permissions": [
    "tabs"
  ],
  "icons": {
    "48": "icons/tapto.png",
    "96": "icons/tapto.png"
  },
  "browser_action": {
    "default_icon": "icons/tapto.png",
    "default_title": "Tapto"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  }
}