Examine source code of AO3_easy_navigation

{
  "manifest_version": 2,
  "name": "AO3_easy_navigation",
  "version": "1.2",
  "description": "easy navigation for AO3",
  "content_scripts": [
    {
      "matches": [
        "*://*.archiveofourown.org/*"
      ],
      "js": [
        "app.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "AO3_easy_navigation@nav"
    }
  }
}