Lately, I've been having a weird problem when browsing sites with Firefox. I use the scroll thingys on my laptop touch pad to scroll up or down rather than clicking on the bar on the right. Lately, after a little bit of time, when I start to scroll, it will make the screen either really big or really small. It's odd. Also, when I click on a link, it will open it in a new tab.
I haven't changed any settings at all, and it does it randomly. If I exit out of Firefox and open it back up, it is usually fine, but it will display the screen how it was left when I closed out (really big, or really small).