Saved Tabs in Firefox Web Browser no longer in effect?

[sam tygier]

On 25/10/11 23:38, jimkvg at 3web.com wrote:
> 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
>

its the first option in the firefox preferences.

also in the history there is a restore previous session option.