first of all you nee to do is :
(1) : Go into your computer
(2) : Select your hard drive
(3) select the file name'it Program files(x86) and select your steam file
(4) : Select stem app
(5) : Select connon and in connon select your call of duty mw3 file
(6) : select players2 and them config_mp
you go to see a window with all your mp setting all you have to do is
on that window press control and f and write any change you want to do at the game like for example if want to change the resolution only write resolution and them search .
i thing with the new update this is patched , but you could try .
---------- Post added at 05:05 PM ---------- Previous post was at 05:03 PM ----------
or you can download a hack to disable the fog or other many things