seen with Tor Browser 8.0a3-build1 on Linux (64 bit) Changing the UI via the menu entry "Customize" does not work anymore because the customization view closes immediately after opening, so drag-and-drop is impossible. Right-clicking on a menu entry and selecting "Move to Toolbar" still works, as well as "Move to Menu" for something which was moved to the toolbar. Maybe legacy/trac#25147 is the reason. **Trac**: **Username**: viktorj