Examine source code of Quote Keeper

{
  "manifest_version": 3,
  "name": "Quote Keeper",
  "version": "1.0",
  "description": "An extension to bookmark quotes.",
  "permissions": [
    "contextMenus",
    "storage",
    "tabs"
  ],
  "background": {
    "service_worker": "background.js",
    "type": "module",
    "scripts": [
      "browserPolyfill.js",
      "background.js"
    ]
  },
  "action": {
    "default_popup": "popup.html"
  },
  "icons": {
    "16": "icons/icon.png",
    "32": "icons/icon.png",
    "48": "icons/icon.png",
    "128": "icons/icon.png"
  },
  "web_accessible_resources": [
    {
      "resources": [
        "popup.js",
        "browserPolyfill.js"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "browserPolyfill.js",
        "content.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "6adab51ece38c62c3a64705009b9333b5b1565d4@quote_keeper"
    }
  }
}