Examine source code of Salt & Pepper for SFMC

{
  "id": "341ceba0-15fa-4006-a6d9-a01e0d4720c1",
  "manifest_version": 3,
  "name": "Salt & Pepper for SFMC",
  "version": "1.3",
  "description": "Add utilities to SFMC Data Extension (Email Studio) and Query Studio",
  "browser_specific_settings": {
    "gecko": {
      "id": "salt_pepper_sfmc@smulla.com",
      "strict_min_version": "58.0"
    }
  },
  "icons": {
    "16": "images/sp-icon-16.png",
    "32": "images/sp-icon-32.png",
    "48": "images/sp-icon-48.png",
    "128": "images/sp-icon-128.png"
  },
  "host_permissions": [
    "http://*/*",
    "https://*/*"
  ],
  "permissions": [
    "clipboardWrite",
    "tabs"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://mc.exacttarget.com/*",
        "https://*.exacttarget.com/*"
      ],
      "exclude_matches": [
        "*://*.login.exacttarget.com/*"
      ],
      "run_at": "document_end",
      "all_frames": true,
      "css": [
        "css/de.css"
      ],
      "js": [
        "scripts/common.js",
        "scripts/de.js"
      ]
    },
    {
      "matches": [
        "https://querystudio.herokuapp.com/"
      ],
      "run_at": "document_end",
      "all_frames": true,
      "css": [
        "css/qs.css",
        "css/qsTypeAssist.css"
      ],
      "js": [
        "scripts/qs.js",
        "scripts/qsTypeAssist.js"
      ],
      "world": "MAIN"
    },
    {
      "matches": [
        "https://embedded.pardot.force.com/prospectField",
        "https://embedded.pardot.force.com/prospectAccount/configureFields",
        "https://embedded.pardot.force.com/opportunity/configureFields"
      ],
      "run_at": "document_end",
      "all_frames": true,
      "js": [
        "scripts/common.js",
        "scripts/mcaeProspectFields.js",
        "scripts/mcaeAvailableFields.js"
      ],
      "css": [
        "css/de.css",
        "css/mcae.css"
      ]
    }
  ]
}