Why the restart firefox bubble does not show after installing an addon and the remember password bubble is closed (not now x)?

When I go to a post login page, firefox offers to remember password. If this bubble is ignored (by pressing the x or by choosing the Not now option) and i download an add-on on that page that requires browser restart, the bubble of "restart now" which should get triggered after the installation of the add-on is not shown.

Note: If i press on Remember password or never remember password on this site, the restart bubble shows.

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