The first is simply getting your home page to open when you open a new tab. It was always annoying when it was blank and you had to type something in.
https://addons.mozil...refox/addon/777
The second is an uncommon one, and a 3 years old one that still amazingly works for FF 3.0. It's called FireFox Startup Enhancer.
I'm not sure how many people get this problem, but I've noticed it on my computer and on those of my friends. When you first boot up the computer, and let everything load, FF will still have an extreme minute or too of jerky lag that makes browsing impossible. Then after a minute everything instantly goes smoothly. This is because FF is being loaded into your computers RAM (or something like that) during that first minute. FF Startup Enhancer will load FF into your RAM on boot up, and it doesn't increase the boot up time by anything noticeable at all.
http://sourceforge.n...ts/ffpreloader/