Examine source code of Text Highlighter max

{
  "manifest_version": 2,
  "name": "Text Highlighter",
  "version": "1.0",
  "description": "A simple add-on to highlight selected text with yellow color.",
  "permissions": [
    "contextMenus",
    "activeTab",
    "storage"
  ],
  "background": {
    "scripts": [
      "popup.js"
    ],
    "persistent": false
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "48": "icon.png"
    }
  },
  "icons": {
    "48": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{2a46c22e-e440-453b-83f4-d73198ae3679}"
    }
  }
}