Examine source code of ReConsider

{
  "manifest_version": 2,
  "name": "ReConsider",
  "version": "1.0.1",
  "description": "ReConsider before visiting certain websites",
  "permissions": [
    "storage",
    "webNavigation",
    "<all_urls>"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "48": "icon-48.png",
      "128": "icon-128.png"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "css": [
        "styles.css"
      ],
      "js": [
        "phrases.js",
        "content.js"
      ],
      "run_at": "document_start"
    }
  ],
  "icons": {
    "48": "icon-48.png",
    "128": "icon-128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "reconsider@example.com",
      "strict_min_version": "79.0"
    }
  },
  "homepage_url": "https://github.com/al3ss4ndrolb/reconsider",
  "options_ui": {
    "page": "popup.html"
  }
}