Did you know that you can set Firefox on startup to load either your home page, or to show your windows and tabs from your last session? The advantage to to latter, of course, is that it restores the state of your session when you last closed Firefox. And you can get to your chosen home page anytime by clicking on the home page icon in the tool bar.

Here's how: On the tool bar click Tools-->Options and then select the Main tab. Then in the Startup Bar choose "Show my windows and tabs from last time." (This will not effect your home page choice.) Its done.

Also, you may have more than one home page.  Just separate them with the bar symbol: |.  It is an upper case backslash, \, on my keyboard, but it is in different places on different keyboards. When you go to your home page(s) all of them will be loaded in different tabs.