何か探索するアレ

$grep.js

function $grep(o, v, p = '') {
  $grep.known = []
  return $grep.find(o, v, p)
}

$grep.match = function (e, v) {
  return v instanceof RegExp ? typeof e !== 'object' && typeof e !== 'function' && v.test(String(e)) : e === v
}

$grep.pandora = function (key) {

  // if (key.startsWith('-')) { return true }

  if (key.startsWith('gm_')) { return true }
  if (key.startsWith('__gm')) { return true }

  if (key === 'streetView') { return true }
  if (key === 'top') { return true }
  if (key === 'window') { return true }
  if (key === 'frames') { return true }
  if (key === 'self') { return true }

  return false
}

$grep.find = function (o, v, p) {

  // match
  if ($grep.match(o, v)) { return p }

  if (o === null || typeof o !== 'object' || o instanceof Node) { return null }

  // dive into
  $grep.known.push(o)

  var names = Object.getOwnPropertyNames(o)
  for (k in names) {
    var n = names[k]

    // avoid chaos
    if ($grep.pandora(n)) { continue }

    try {
      var e = o[n]

      // known?
      if ($grep.known.lastIndexOf(e) != -1) { continue }

      // log scan path
      var path = p + (isNaN(+n) ? '.' + n : '[' + n + ']')
      if (typeof e === 'number' || typeof e === 'string') {
        // console.log(path + ': ' + e)
      } else {
        // console.log(path)
      }

      // found?
      var found = $grep.find(e, v, path)
      if (found !== null) { return found }

    } catch (e) {
       // boo!
    }

  }

  return null

}

$grep(this, /Hoge/)