Examine source code of Linkover – preview link info on hover

{
  "name": "Linkover – preview links info on hover",
  "description": "__MSG_appDescription__",
  "version": "1.2.6",
  "author": "emvaized",
  "manifest_version": 3,
  "default_locale": "en",
  "permissions": [
    "<all_urls>",
    "storage"
  ],
  "icons": {
    "128": "./assets/icon.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "service_worker": "background.js"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "index.js"
      ],
      "css": [
        "index.css"
      ],
      "run_at": "document_start"
    }
  ],
  "action": {
    "default_icon": "./assets/icon.png",
    "default_title": "__MSG_appName__",
    "default_popup": "options/options.html"
  },
  "options_ui": {
    "page": "options/options.html",
    "open_in_tab": false
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "linkover@emvaized.dev"
    }
  },
  "web_accessible_resources": [
    {
      "resources": [
        "assets/loading.gif"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ]
}