Examine source code of Explicit Blocker

{
  "manifest_version": 2,
  "name": "Keyword Blocker",
  "version": "1.0.2",
  "description": "Logic-based keyword blocking for Firefox.",
  "browser_action": {
    "default_popup": "popup.html",
    "default_title": "Keyword Blocker"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "keyword-blocker-logic@extension.local",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "storage",
    "tabs",
    "https://*/*",
    "http://*/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "browser-polyfill.js",
        "content.js"
      ],
      "run_at": "document_start",
      "all_frames": true
    }
  ]
}