The "Bookmark All Tabs" option is available if you right-click on a tab. You can also use the keyboard shortcut Control+Shift+D

I almost uninstalled and went back to Firefox 3 because they eliminated this option from the stock 4 version but there is a simple solution.

To "bookmark all tabs" in Firefox 4 and later versions just add the add-on feature at the link below which will restore the "Bookmark All" feature and can be accessed under the Tools menu, or directly by using the shortcut "Control-Shift-D" but this only works after you have installed the add-on feature. Hope this helps! :D

https://addons.mozilla.org/en-us/firefox/addon/bookmark-all/

Try using the MenuManipulator extension.

http://forums.mozillazine.org/viewtopic.php?t=272717 After installing, and restarting Firefox. 1. open the MenuManipulator dialog in the Tools menu(May need to temporarily bring up Menu bar) 2. right click on the "BMB_bookmarksPopup" menupopup id 3. select New > Menu Item 4. enter label "Bookmark All Tabs" 5. move menuitem below the "Subscribe to This Page" menu label 6. Look to the right side of the dialog screen, right click on the right side of the MenuManipulator dialog(the “bookmark all tabs” line) 7. select Insert 8. enter attribute name "command" 9. enter attribute value "Browser:BookmarkAllTabs" 10. click OK

This will work for the more recent versions of firefox, I got it to work on version 6.