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My pinned tabs keep disappearing upon opening Firefox

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I have about 6 - 8 pinned tabs. Upon opening Firefox (Mac OS), sometimes one pinned tab disappears, and now, most recently, almost all have disappeared. Restarting Firefox a couple times still hasn't repopulated my original pinned tabs.

Any help/explanation would be appreciated.

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Pinned tabs are stored as part of session data in sessionstore.jsonlz4.

Make sure you do not close open windows, but close the Firefox application (Firefox -> Quit) while all window(s) are still open.

On Mac things can be more complicated because you can close all open windows, but keep Firefox running with the menu bar visible or minimized to the Doc.