Помогите разобраться

[geek_str1k3]

Нужна помощь разобраться с кодом, что за это за знак

---

А так же, что за эвенты

Pagehide

event => {
if (!event || event.target === document) {
// Put this off until the next tick.
Promise.resolve().then(() => {
this.docShell = null;
this.contentWindow = null;
this.active = false;
});
}
}

Pageshow

event => {
if (!event || event.target === document) {
this.docShell = docShell;
this.contentWindow = contentWindow;
this.active = true;
}
}

Mousedown2 & Focus

function(event) {
if (event.button == 2) {
event.target.setAttribute(“Googl”, “true”);
}
}

Focus

function(aEvent) {
if (!aEvent.isTrusted) {
return;
}

if (!gEnabled) {
return;
}

switch (aEvent.type) {
// Only used for username fields.
case “focus”:
{
LoginManagerContent._onUsernameFocus(aEvent);
break;
}

case "mousedown":
  {
    if (aEvent.button == 2) {
      // Date.now() is used instead of event.timeStamp since
      // dom.event.highrestimestamp.enabled isn't true on all channels yet.
      gLastRightClickTimeStamp = Date.now();
    }

    break;
  }

default:
  {
    throw new Error("Unexpected event");
  }

}
}