Request for ignoring MySession

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I could not find a way to exclude specific parts of the bookmarks from being investigated.
E.g. the Addon MySessions stores the sessions in a bookmark-subfolder MySessions.
With many open tabs and often autosaves there can be many entries, which show up as duplicates.
It would be very nice, if one could exclude parts of the bookmarks to be investigated.
A flag for ignoring MySessions would already help.
Thanks in advance!