Examine source code of Overlay

{
  "name": "Overlay",
  "version": "1.18.6",
  "description": "description",
  "permissions": [
    "storage",
    "tabs",
    "https://deps.dev/*",
    "https://debricked.com/*",
    "https://socket.dev/*",
    "https://snyk.io/*"
  ],
  "icons": {
    "48": "icons/icon_48.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://stackoverflow.com/*"
      ],
      "js": [
        "content.stackoverflow.js"
      ]
    },
    {
      "matches": [
        "*://www.npmjs.com/*"
      ],
      "js": [
        "content.npmjs.js"
      ]
    },
    {
      "matches": [
        "*://pypi.org/project/*"
      ],
      "js": [
        "content.pypi.js"
      ]
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": "icons/icon_48.png",
    "default_title": "Overlay",
    "default_popup": "popup/index.html"
  },
  "web_accessible_resources": [
    "custom-elements.js",
    "custom-elements.css"
  ],
  "manifest_version": 2,
  "browser_specific_settings": {
    "gecko": {
      "id": "{ce34d01b-8ca1-4b20-abf5-4cf0a329fd66}"
    }
  }
}