Modify Auto-Hide Conditions for Add-on Popups

[kairi]

Currently, in Firefox, add-on popups are immediately closed when they lose focus.
This behavior is inconvenient, especially when opening a Save As dialog causes the popup window to close.

For example, if a popup generates a Blob URL and attempts to download it using the Download API, the popup closes, revoking the URL and causing the download to fail. Additionally, any post-download actions become impossible.
Furthermore, users might want to save multiple media files via right-click from the popup, but the current behavior prevents them from doing so as the popup closes each time.

I suggest modifying this behavior so that popups do not close when focus moves to a window outside of Firefox, but only when switching to another document within Firefox.

[Jon]

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