Examine source code of Dual Blocker

{
  "manifest_version": 2,
  "name": "Dual Blocker",
  "version": "0.5.6",
  "browser_specific_settings": {
    "gecko": {
      "id": "dualblock@vtmsw.cz",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "description": "Fast browsing via regular expressions",
  "permissions": [
    "<all_urls>",
    "webRequest",
    "webRequestBlocking",
    "proxy",
    "activeTab",
    "tabs",
    "webNavigation",
    "scripting",
    "menus",
    "storage"
  ],
  "background": {
    "scripts": [
      "includes.js",
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "run_at": "document_start",
      "all_frames": true,
      "js": [
        "includes.js",
        "content.js"
      ]
    }
  ],
  "web_accessible_resources": [
    "inject.js"
  ],
  "browser_action": {
    "default_title": "Connect via Proxy",
    "browser_style": true,
    "default_icon": "/icons/proxyconn_1.svg"
  },
  "page_action": {
    "default_title": "Reload Regexes",
    "browser_style": true,
    "default_icon": "/icons/regexreload.svg"
  },
  "icons": {
    "16": "/icons/dualblock.svg",
    "32": "/icons/dualblock.svg",
    "64": "/icons/dualblock.svg"
  },
  "options_ui": {
    "browser_style": true,
    "page": "settings.html"
  }
}