HideChatRail is a script which makes it possible to use the chat window in a smaller size. For that you are able to hide the rail.
To minimize the rail you just have to click on your profile at the top right hand corner. If there is an unread message in another chat, you will be notified by a bouncing icon.
Open the rail by clicking on your profile.
Chats with unread messages will bounce around to notify you.
Note: In this example, pay close attention to the placement of commas and other punctuation. For people who aren't familiar with programming (and even those who are!), a common mistake when writing code is to accidentally delete, forget, or misplace critical symbols like commas or quotation marks. This can cause a syntax error that breaks the code. Carefully follow the convention shown here when using importArticles.