When using an appMenu that requires interaction, the panel appears in all windows. It should only appear in the top window. addon-installed is a good example of a panel that requires interaction.

STR:

• install a theme
• when you see the post-install panel that says it is installed, open a new window
• switch back to the prior window

Expected:

• panel is open only in one window, the active window. (ie. it should close/open appropriately for whatever window the user is in).

Actual:

• panel is open in both windows

Other than the panels being shown, there are no other side effects. When the user interacts, the notification callbacks only happen once, for the active window. All panels are closed when the user interacts.

I meant to include more info.

The code that seems to cause this[1] doesn't close the panel, I expect it is not accounting for noauthhide.

[1] https://searchfox.org/mozilla-central/rev/89414a1df52d06cfc35529afb9a5a8542a6e4270/browser/components/customizableui/content/panelUI.js#709-718