Examine source code of Cite This For Me: Web Citer

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  "action": {},
  "background": {
    "scripts": [
      "js/background.js"
    ]
  },
  "content_scripts": [
    {
      "js": [
        "js/contentscript.js"
      ],
      "matches": [
        "*://*/*"
      ]
    }
  ],
  "content_security_policy": {
    "extension_pages": "script-src 'self'; object-src 'self'"
  },
  "description": "Automatically create website citations in the APA, MLA, Chicago, or Harvard referencing styles at the click of a button.",
  "homepage_url": "http://www.citethisforme.com",
  "host_permissions": [
    "*://*/*"
  ],
  "icons": {
    "16": "images/icon-16.png",
    "18": "images/icon-18.png",
    "19": "images/icon-19.png",
    "32": "images/icon-32.png",
    "48": "images/icon-48.png",
    "128": "images/icon-128.png"
  },
  "manifest_version": 3,
  "name": "Cite This For Me: Web Citer",
  "permissions": [
    "tabs",
    "storage",
    "scripting",
    "declarativeNetRequest"
  ],
  "version": "2.7.0",
  "browser_specific_settings": {
    "gecko": {
      "id": "{c5e6f7a8-9d1b-4c2a-8e3d-7f4a5b6c8d9e}",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "declarative_net_request": {
    "rule_resources": [
      {
        "id": "websiterules",
        "enabled": true,
        "path": "rules.json"
      }
    ]
  },
  "web_accessible_resources": [
    {
      "matches": [
        "<all_urls>"
      ],
      "resources": [
        "/images/*"
      ]
    },
    {
      "matches": [
        "<all_urls>"
      ],
      "resources": [
        "/popup.htm"
      ]
    },
    {
      "matches": [
        "<all_urls>"
      ],
      "resources": [
        "js/*"
      ]
    },
    {
      "matches": [
        "<all_urls>"
      ],
      "resources": [
        "css/*"
      ]
    }
  ]
}