Examine source code of secure-password-manager

{
  "manifest_version": 2,
  "name": "Credential Saver",
  "version": "1.0",
  "description": "An add-on that prompts the user to save website credentials.",
  "permissions": [
    "tabs",
    "storage"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "browser_action": {
    "default_title": "Credential Saver",
    "default_popup": "popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{ca4304eb-60e0-4b20-b980-d83bc866dfba}"
    }
  }
}