Firefox ... Good? Bad?

[Cinjin]

I downloaded Firefox because I was told it had good security and blah blah blah.

So basically I need to know if this was a good choice or if I should try again as it were.


and two ... and this is stupid ...

but, my cursor is constantly jumping around my screen while I'm typing. Sometimes moving to my pointer, sometimes a tab button ... Very Annoying!
I've never had this problem before with any other browsers and I'm wondering is their something I can toggle off or reset or chuck through a window pane.


Anyone?
I'm a construction superintendent ... computer jargon is only somewhat familiar to me. I could use some assist.