Examine source code of Highlighter

{
  "manifest_version": 3,
  "name": "Highlighter",
  "version": "1.0.1",
  "description": "A cross-browser extension for highlighting text",
  "author": "Alvaro Cavalcanti",
  "homepage_url": "https://memorablenaton.es/highlighter",
  "permissions": [
    "storage",
    "activeTab",
    "contextMenus"
  ],
  "action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icons/icon16.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    },
    "default_title": "Highlighter Extension"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "type": "module"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "browser_specific_settings": {
    "edge": {
      "browser_action_next_to_address_bar": true
    },
    "gecko": {
      "id": "highlighter@memorablenaton.es"
    }
  },
  "web_accessible_resources": [
    {
      "resources": [
        "content/index.js"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ]
}