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# 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:
```