Examine source code of MeanMarker

{
  "manifest_version": 3,
  "name": "MeanMarker",
  "version": "1.0.2",
  "description": "Personal word meanings — one hover away!",
  "browser_specific_settings": {
    "gecko": {
      "id": "dev.vitorpfontes002@gmail.com"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "src/index.js",
        "src/ui.js",
        "src/highlight.js"
      ],
      "css": [
        "src/style.css"
      ]
    }
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "src/*"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ],
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  }
}