I just found out from another forum on how to set a multiple home pages with just one click from your firefox broswer. Just go to Tools > then if your homepage is already set to google then you can add another search engine like yahoo.. just add this | .. you can see the sample below
I used to use this, but for some reason (I'm not sure if it's suppose to do this) but if I have multiple tabs open, it will replace the last 3 of them with my 3 homepages. I would rather have it open three new tabs all together.