Examine source code of Roam Navigator

{
  "name": "Roam Navigator",
  "author": "Michael Sloan",
  "description": "Adds visual keyboard navigation to Roam (https://roamresearch.com/).",
  "version": "18",
  "homepage_url": "https://github.com/mgsloan/roam-navigator",
  "content_scripts": [
    {
      "matches": [
        "*://roamresearch.com/*"
      ],
      "js": [
        "inject.js"
      ],
      "all_frames": true
    }
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "roam-navigator.js"
      ],
      "matches": [
        "*://roamresearch.com/*"
      ]
    }
  ],
  "permissions": [
    "storage"
  ],
  "action": {
    "default_popup": "options-popup.html",
    "default_icon": {
      "128": "icon128.png"
    }
  },
  "icons": {
    "128": "icon128.png"
  },
  "content_security_policy": {
    "script-src": "'self'"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{c49edf46-59ee-429b-b1fa-5e8f1c593ec4}",
      "strict_min_version": "109.0"
    }
  },
  "manifest_version": 3
}