richard, I think I am following your situation:
in NS 8.0.1....win xp-home
Using your sites:
thomasnet.com, google.com, superpages.com, and answers.com
I went to each site and opened it in a tab.
I deleted any other tabs leaving only the four site/tabs referenced:
I selected "Bookmark this group of tabs"
In the dialog box I entrered "N.I.S search" for Name.
Create in: = jim_ns8 ( one of my bookmark folders )
checked the "Bookmark all tabs in folder"
Selected "ok"
Opened "manage bookmarks" - selected "jim_ns8" in left panel.
In right panel is desplayed contents of "jim_ns8" folder - at the very bottom is "N.I.S search" folder
I moved ( dragged ) it to the top of the folder ( in the right panel) closed bookmark manager.
TO test things - I closed ALL tabs but one ( silly dog)
Selected "jim_ns8" folder in PersonalToolbar bookmarks - The top entry is "N.I.S search" - select entry - displayes drop down menu - select bottom entry "Open in Tabs"
the four tabs open - for a total of five open tabs. the NEW tab group and the original tab that was open.
In my Options - Tabbed Browsing - top section
Open new tab = far right
bottome section - Open Behavior - Bookmarks = add tabs
and that is what happens -
Also check in about:config - filter on:
browser.tabs.loadFolderAndReplace -
I believe that the default is "true"
if it is set to "true" change it to "false"
Otherwise I am out of ideas....
HTH
regards:captjlddavis
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old age and treachery will overcome youth and skill everytime......