Un-nest sass styles

[AndrewRayCode]

These styles are not well optimized

#TDFriendSelector {
    ...
    .TDFriendSelector_dialog {
        ...
        #TDFriendSelector_buttonClose {

Because you are prefixing everything with TDFriendSelector there is no need to nest styles. This creates very inefficient nested CSS selectors, which is important to optimize for dynamic dom elements, like a friend selector.