# CustomizableUI Module

The CustomizableUI module is responsible for managing the default and
customized state of various surfaces within the browser. At this time, this
includes surfaces like:

1. The navigation toolbar
2. The tabs toolbar (in horizontal tabs mode)
3. The bookmarks toolbar
4. The overflow panel
5. The menubar (on Linux and Windows)

```{js:autoclass} CustomizableUI
:members:
:private-members:
```
