Алексей A

// ==UserScript==
// @name        page404handler
// @namespace   page404handler
// @version     0.0.1
// @include     *
// @grant       none
// @run-at      document-start
// ==/UserScript==

  var url = document.location.href;
  var xhr = new XMLHttpRequest();

  xhr.onreadystatechange = function() {
    if (xhr.readyState == 4 && xhr.status === 404) {
      console.log('Page not found');
      // do something
    }
  }
  xhr.open('GET', url, true);
  xhr.send();

.questions {
    &__btn {
    color:red;
    }
    &__btn2 {
    color:green;
    }
}

.another-questions {
    &__btn {
    .questions;
    }
}

.questions__btn {
  color: red;
}
.questions__btn2 {
  color: green;
}
.another-questions__btn__btn {
  color: red;
}
.another-questions__btn__btn2 {
  color: green;
}

.questions {
    &__btn {
    color:red;
    }
    &__btn2 {
    color:green;
    }
}

.another-questions {
    .questions;
}

.questions__btn {
  color: red;
}
.questions__btn2 {
  color: green;
}
.another-questions__btn {
  color: red;
}
.another-questions__btn2 {
  color: green;
}

function setCall_Cookie(name, value, props) {
    props = props || {};
    var exp = props.expires;
    if (typeof exp == "number" && exp) {
        var d = new Date();
        d.setTime(d.getTime() + exp * 1000);
        exp = props.expires = d;
    }
    if (exp && exp.toUTCString) {
        props.expires = exp.toUTCString();
    }
    value = encodeURIComponent(value);
    var updatedCookie = name + "=" + value;
    for (var propName in props) {
        updatedCookie += "; " + propName;
        var propValue = props[propName];
        if (propValue !== true) {
            updatedCookie += "=" + propValue;
        }
    }
    updatedCookie += "; path=/";
    document.cookie = updatedCookie;
}
var call_value = '0';