Examine source code of MPR Lookup

{
  "manifest_version": 3,
  "name": "MPR Lookup",
  "version": "1.2.9",
  "description": "US phone lookup while browsing: MPReviews ratings, intel & profiles when data exists.",
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "permissions": [
    "storage",
    "tabs"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "exclude_matches": [
        "https://mpreviews.com/*",
        "https://www.mpreviews.com/*"
      ],
      "js": [
        "mpr_utm.js",
        "content.js"
      ],
      "css": [
        "style.css"
      ],
      "run_at": "document_idle"
    }
  ],
  "action": {
    "default_popup": "popup.html",
    "default_title": "MPR Lookup",
    "default_icon": {
      "16": "icon16.png",
      "48": "icon48.png",
      "128": "icon128.png"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "mpr-extension@mprreviews.com",
      "data_collection_permissions": {
        "required": [
          "personallyIdentifyingInfo",
          "websiteContent",
          "browsingActivity"
        ],
        "optional": [
          "technicalAndInteraction"
        ]
      }
    }
  }
}