Examine source code of Knockoffox — Amazon Brand Filter

{
  "manifest_version": 3,
  "name": "Knockoffox — Amazon Brand Filter",
  "version": "0.2.0",
  "description": "Firefox extension that filters pseudo-brand junk out of Amazon and optionally hides sponsored listings.",
  "permissions": [
    "storage"
  ],
  "icons": {
    "16": "icons/icon16.png",
    "32": "icons/icon32.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "action": {
    "default_icon": {
      "16": "icons/icon16.png",
      "32": "icons/icon32.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    }
  },
  "background": {
    "scripts": [
      "src/background.js"
    ]
  },
  "options_ui": {
    "page": "options/options.html",
    "open_in_tab": true
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "knockoffox@moonquake.io",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "content_scripts": [
    {
      "matches": [
        "https://www.amazon.com/*",
        "https://www.amazon.ca/*",
        "https://www.amazon.com.mx/*",
        "https://www.amazon.com.br/*",
        "https://www.amazon.co.uk/*",
        "https://www.amazon.ie/*",
        "https://www.amazon.de/*",
        "https://www.amazon.fr/*",
        "https://www.amazon.it/*",
        "https://www.amazon.es/*",
        "https://www.amazon.nl/*",
        "https://www.amazon.se/*",
        "https://www.amazon.pl/*",
        "https://www.amazon.com.be/*",
        "https://www.amazon.com.tr/*",
        "https://www.amazon.ae/*",
        "https://www.amazon.sa/*",
        "https://www.amazon.eg/*",
        "https://www.amazon.co.za/*",
        "https://www.amazon.in/*",
        "https://www.amazon.co.jp/*",
        "https://www.amazon.sg/*",
        "https://www.amazon.com.au/*"
      ],
      "js": [
        "data/community-brands.js",
        "data/known-brands.js",
        "data/chinese-major.js",
        "data/flagged-brands.js",
        "data/generic-words.js",
        "src/detector.js",
        "src/pdp-brand.js",
        "src/content.js"
      ],
      "css": [
        "src/styles.css"
      ],
      "run_at": "document_end"
    }
  ]
}