Examine source code of Page Highlighter Tool

{
  "manifest_version": 2,
  "name": "Page Highlighter Tool",
  "version": "1.0",
  "description": "Highlight selected text on any webpage with a chosen color.",
  "permissions": [
    "activeTab"
  ],
  "browser_action": {
    "default_icon": "icon.png",
    "default_title": "Page Highlighter Tool",
    "default_popup": "popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{3f365223-05bf-4d29-ab69-989a42b21ad9}"
    }
  }
}