Examine source code of Link Viewer

{
  "manifest_version": 2,
  "name": "Link Viewer",
  "version": "1.0",
  "description": "Displays all links from the current page in a popup.",
  "icons": {
    "64": "icon64.png",
    "128": "icon128.png"
  },
  "permissions": [
    "activeTab",
    "tabs"
  ],
  "browser_action": {
    "default_icon": "icon64.png",
    "default_popup": "popup.html",
    "default_title": "View Page Links"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{b6f4830f-26d8-49e2-9fc6-4cfd036c351e}",
      "strict_min_version": "117.0"
    }
  }
}