Examine source code of AmazonBrandFilter

{
  "browser_specific_settings": {
    "gecko": {
      "id": "abf@mosley.xyz",
      "strict_min_version": "113.0"
    },
    "gecko_android": {
      "strict_min_version": "113.0"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "type": "module"
  },
  "content_security_policy": {
    "extension_pages": "default-src 'self'; script-src 'self'; object-src 'none'; connect-src https://raw.githubusercontent.com/chris-mosley/AmazonBrandFilterList/main/brands.txt https://api.github.com/repos/chris-mosley/AmazonBrandFilterList/releases/latest;"
  },
  "web_accessible_resources": [
    {
      "resources": [
        "brands.txt"
      ],
      "matches": [
        "https://raw.githubusercontent.com/chris-mosley/AmazonBrandFilterList/main/brands.txt",
        "https://api.github.com/repos/chris-mosley/AmazonBrandFilterList/releases/latest"
      ]
    },
    {
      "resources": [
        "brands.txt"
      ],
      "matches": [
        "*://*/*"
      ]
    }
  ],
  "version": "0.8.0",
  "name": "AmazonBrandFilter",
  "description": "Filters out all unknown brands from Amazon search results.",
  "manifest_version": 3,
  "default_locale": "en",
  "icons": {
    "128": "icons/abf-disabled-128.png"
  },
  "permissions": [
    "storage",
    "activeTab"
  ],
  "action": {
    "default_title": "Amazon Brand Filter",
    "default_area": "navbar",
    "default_popup": "popup.html"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.amazon.com/*",
        "*://*.amazon.ca/*",
        "*://*.amazon.cn/*",
        "*://*.amazon.co.jp/*",
        "*://*.amazon.com/*",
        "*://*.amazon.com.au/*",
        "*://*.amazon.com.mx/*",
        "*://*.amazon.co.uk/*",
        "*://*.amazon.de/*",
        "*://*.amazon.es/*",
        "*://*.amazon.fr/*",
        "*://*.amazon.in/*",
        "*://*.amazon.it/*",
        "*://*.amazon.nl/*"
      ],
      "js": [
        "content.js"
      ]
    }
  ]
}