Saved Tabs in Firefox Web Browser no longer in effect?

[jimkvg at 3web.com]

After upgrading my Ubuntu 10.10 to 11.04, I noticed change in the  
Firefox Web Browser to my disappointment.  In the 10.10, I enjoyed  
opening Firefox Web Browser to several tabs automatically opened as  
they were saved when closed.  Now I have to dig up long list of  
bookmarks to open up to click some e.g. mail, weather, news, etc.  
every time I opened Firefox Web Browser.  I tried its Tools, but I  
could not find one to add the feature.  Did I missed something?  Any  
tip will be appreciated.  Thank you.  Jim