I would really appreciate some direction as I am not the fastest gazelle on the serengeti. I have Firefox setup as my home page on both my laptop and my desktop. My laptop, the bottom image, is just what I want but my desktop is not. There are 8 icons in the middle of the page and I would like to turnoff the automatic update for these icons and insert my preferred links there instead but I just cannot figure it out. And, as in the bottom image below, I cannot get the (+) sign to reappear for editing purposes.

There is an image of the current icons below.