Examine source code of BetTOR Isolation

{
  "manifest_version": 2,
  "name": "BetTOR Isolation",
  "version": "1.5.1",
  "background": {
    "scripts": [
      "common.js",
      "background.js"
    ]
  },
  "permissions": [
    "proxy",
    "storage",
    "tabs",
    "notifications",
    "<all_urls>"
  ],
  "commands": {
    "_execute_browser_action": {
      "suggested_key": {
        "default": "Shift+Alt+C"
      },
      "description": "Open the new *C*ircuit popup"
    }
  },
  "options_ui": {
    "browser_style": false,
    "page": "settings.html"
  },
  "browser_action": {
    "default_popup": "new_circuit.html"
  }
}