Steps to reproduce
- Open https://fable.io/repl4/ in Firefox (tested with 102.0 on Ubuntu+GNOME Flashback)
- Click on the gear icon in the left sidebar
- Click on the
<select> under Language
- Move the mouse pointer downwards to select a different entry
Expected behavior
The menu stays open and you can select your desired target language.
Actual behavior
The menu closes as soon as you move the mouse, making it impossible to change the setting.
Note
In Chrome it seems to work fine.