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Pinned tabs get unpinned after restart

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When I restart Firefox, pinned tabs get unpinned (all but the first one out of 3). They stay open though.

When I restart Firefox, pinned tabs get unpinned (all but the first one out of 3). They stay open though.

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As it turns out, the tabs that get unpinned are the ones suspended by this add-on: https://addons.mozilla.org/en-US/firefox/addon/tab-suspender-tab-unloader/ Is it most likely their bug?