You can:

• right-click a tab and choose "Bookmark All Tabs"
• CTRL+Shift+D
• {item deleted by SafeBrowser}

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Item #66 answers what happened to it (see last footnote)

Bookmark all Tabs (tabs context & bookmarks menu) 3.6 and 5.0, grayed out in both 3.6 and 5.0 & 6.0 when only 1 tab.

I expect single tab from context menu was dropped to make room for pinning a tab in 5.0 & 6.0 (app-tab) in tab context menu. (Google Chrome uses bookmark all tabs for 1 tab or all in tab context menu.)

Better than bookmark all tabs: (which is still available from tabs context menu)

If you would like something a lot more flexible, install "Multiple Tab Handler", which will allow you to bookmark any selection of tabs, it is unlikely that you want want to always bookmark your app-tabs time after time (though they should be bookmarked separately as a group).

It provides lots of features for handling multiple tabs: pinning a selection of tabs (app-tabs), pasting titles & urls in various formats. Closing selected tabs, or all tabs to the right/left. Closing tabs to the right is especially useful if using app-tabs.

Multiple Tab handler ( 74.8KB download) see my usage notes

• https://addons.mozilla.org/firefox/addon/multiple-tab-handler/
• http://dmcritchie.mvps.org/firefox/multiple_tab_handler.txt

If you want to test out the functionality of anything involving Tab use this test page. (the strange name is derived from my keyword shortcut to the page is "_")

• http://dmcritchie.mvps.org/firefox/tab_capacity/001_with_underscore.htm

For additional information on tabbed usage see:

• Tabbed Browsing in Firefox
  http://dmcritchie.mvps.org/firefox/tabs.htm

item #66 can be found in the following:

You can make Firefox 6.0 look like Firefox 3.6.*, see numbered items 1-10 in the following topic Fix Firefox 4.0 toolbar user interface, problems (Make Firefox 4.0 thru 6.0, look like 3.6). Whether or not you make changes, you should be aware of what has changed and what you have to do to use changed or missing features.

• http://dmcritchie.mvps.org/firefox/firefox-problems.htm#fx4interface

Thank you both. Will try "Multiple Tab Handler. It is interesting that the only command that brings up the "Bookmark All Tabs" function in my version is right-clicking a tab. The Bookmarks Pull-Down on the Menu Bar does not contain the "Bookmark All Tabs" function. Have a great day!

Not Firefox button > Bookmarks; there is no "Bookmark All Tabs" selection there.

If you follow the steps in the 3rd bulleted item, it should be there.

Understood & followed directions on 3rd bulleted item. But no "Bookmark All Tabs" in the Menu Bar either. Only one that yields that command is the Right Click a Tab.

tomopark, you are correct. I have an add-on that is putting that entry there. I have edited my original reply to reflect the change.