Examine source code of DataMask

{
  "manifest_version": 2,
  "name": "Datamask",
  "description": "DATAMASK: Protect and Manage your Data",
  "version": "2.1.8",
  "icons": {
    "48": "images/icon-32.png",
    "96": "images/icon-128.png",
    "128": "images/icon-128.png",
    "256": "images/icon-256.png",
    "512": "images/icon-512.png"
  },
  "browser_action": {
    "default_title": "HUDI",
    "default_popup": "./popup/index.html",
    "default_icon": {
      "16": "images/icon-16.png",
      "19": "images/icon-32.png",
      "32": "images/icon-32.png",
      "38": "images/icon-32.png",
      "48": "images/icon-32.png",
      "72": "images/icon-128.png"
    }
  },
  "background": {
    "scripts": [
      "./browser-polyfill.js",
      "./background/index.js"
    ],
    "persistent": false
  },
  "permissions": [
    "tabs",
    "activeTab",
    "storage",
    "privacy",
    "webRequest",
    "webRequestBlocking",
    "scripting",
    "nativeMessaging",
    "notifications",
    "topSites",
    "management",
    "cookies",
    "<all_urls>"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "datamask@humandataincome.com",
      "strict_min_version": "57.0"
    }
  },
  "externally_connectable": {
    "matches": [
      "https://humandataincome.com/*",
      "https://www.humandataincome.com/*",
      "https://app.humandataincome.com/*",
      "https://dapp.humandataincome.com/*",
      "https://asset.humandataincome.com/*",
      "https://sdk.humandataincome.com/*",
      "https://demo.humandataincome.com/*",
      "https://theoremreach.com/*",
      "https://wss.pollfish.com/*",
      "https://zampparticipant.zamplia.com/*",
      "https://www.surveygizmo.com/*",
      "https://www.samplicio.us/*",
      "https://survey.bz/*",
      "https://spectrumsurveys.com/*",
      "https://spectrumsurveys.com/*",
      "https://fusion.spectrumsurveys.com/*",
      "https://www.prsrvy.com/*",
      "https://surveymyopinion.researchnow.com/*",
      "https://edgesurvey.innovatemr.net/*",
      "https://web.bitlabs.ai/*"
    ]
  },
  "web_accessible_resources": [
    "autofill-features/*",
    "onboarding/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "./content/autofill.utils.js",
        "./content/autofill.js"
      ],
      "run_at": "document_end"
    }
  ]
}