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Unwanted opening in Bookmarks

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Firefox in suddenly opening with unsolicited tabs for a folder in my Bookmarks, even though there is NO tick in the box for 'Open previous windows and tabs' in STARTUP; how can I stop that from happening ?

Firefox in suddenly opening with unsolicited tabs for a folder in my Bookmarks, even though there is NO tick in the box for 'Open previous windows and tabs' in STARTUP; how can I stop that from happening ?

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Thank you for the suggestion. By trial and error, I discovered that I could solve the problem (for the time being ?) by closing each tab individually; when I closed and re-opened Firefox, its appearance was 'normal' again.

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The last session may be restored automatically if the browser crashes or if the system is shutdown while Firefox is still running.

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Neither crash not shutdown had happened.