It looks like instead of showing/hiding tabs, it actually closes and opens them: https://github.com/mozilla/multi-account-containers/blob/d654810d/src/js/background/backgroundLogic.js#L315 Unfortunately, we prevent extensions from opening `file://` urls for security reasons, we only support limited interactions with local files that the user explicitly opens themselves.
Bug 1620757 Comment 5 Edit History
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It looks like instead of showing/hiding tabs, it actually closes and opens them: https://github.com/mozilla/multi-account-containers/blob/d654810d/src/js/background/backgroundLogic.js#L315 Unfortunately, we prevent extensions from opening `file://` urls for security reasons, we only support limited interactions with local files that users explicitly open themselves.