I can confirm this issue with orca 3.36.2-pre and FF 74.0. The
list items are not spoken.
To reproduce try the following steps using orca from master or
orca 3.36.1:
1. Launch FF and visit https://code.visualstudio.com/docs#vscode.
2. After the page is loaded press ctrl+home and press the h key
until orca announces the following:
Visual Studio Code in Action
3. Press the down arrow one time.
Orca announces a list box.
4. Press down arrow again.
orca stays mute.
5. You must press the down arrow until the orca announces that
it has left the list box.
Thanks.
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Orca wiki: https://wiki.gnome.org/Projects/Orca
Orca documentation: https://help.gnome.org/users/orca/stable/
GNOME Universal Access guide: https://help.gnome.org/users/gnome-help/stable/a11y.html