Why does my browser close/refresh every time I use Cheat Engine on certain games? Could it be that I'm increasing the numbers to much? The maximum is 9 9's (999999999).

Care to be more specific? What causes the crash? It's highly doubtful that simply by being there CE causes a browser crash.

A very common cause is incorrect value. For example, if the appearance is 4b*8 and you accidentally insert it as a non-8 multiplication (like 13.)

An example is on "The Last Stand 2," when i change the value of hours, I do it by multiplying 12*8 (which is the starting number), then change it to 11*8 on 4 bytes/exact value. Then it says "An error has occured and IE, Firefox, or Chrome must shut down- blah blah blah.

Oh I know, but I just found out that it's because I was increasing the numbers wrong, as in if I'm supposed to multiply 200 by 8 and get 1600, I'd in increase it to 999999999, rather than another multiple of 8, so yeah.