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Several windows that won't re-open upon starting

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I have several windows that won't open upon starting Firefox. I had 7 windows with multiple tabs open when last closed. They usually all open again (per my settings) when I open, but this time only 2 opened. I ultimately moved all tabs to new windows, but one window that has only one tab with "OneTab" (from the OneTab extension) in it won't open. And I can't move that tab anywhere. That "Onetab" has multiple important tab. Any idea for solutions?

I have several windows that won't open upon starting Firefox. I had 7 windows with multiple tabs open when last closed. They usually all open again (per my settings) when I open, but this time only 2 opened. I ultimately moved all tabs to new windows, but one window that has only one tab with "OneTab" (from the OneTab extension) in it won't open. And I can't move that tab anywhere. That "Onetab" has multiple important tab. Any idea for solutions?
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Did you use the "cnt-shft-t" to reopen the sessions? If the browser doesn't close correctly or crash during close it will loose the sessions and only other check is to look at the history to find them. Extensions aren't part of the user help but to contact the Developer for help on their extensions issues.

Helpful?

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I've never tried using Firefox View with OneTab. When you use OneTab, I think you need to use its sidebar to manage hidden tab groups.

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