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Tab loss prevention:
Preferences / Launching Opus / Startup / Backup open Listers automatically every X minutes
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Incognito mode:
Collapsing the tree can be done in one click. Some of the history lists can be cleared via commands/buttons/hotkeys, and most can also be cleared by deleting the corresponding files out of the State Data folder, which probably takes care of those.
Please Ask one question per thread so we can track requests and to help other people find them.