Hmm, the only explanation I can think of for why pressing alt+f4 would 
bring up Firefox on a Windows machine is that the keyboard might be 
operating in a different language. This is a long rambling explanation, 
but I get to the point eventually.


I sometimes type Spanish, so I have set my computer up to switch between 
English and Spanish input. When I press left shift plus left alt, the 
keyboard layout changes, and so does the language Windows thinks I'm 
using. Sometimes I accidentally change the input by holding left shift 
or left alt down too long.


Also, by default, Windows 10 tries to guess which language you're using, 
so the input language can change without my doing much of anything. For 
example, I'm on a knitting list, and sometimes when I write a snippet 
from a pattern that includes yarn overs, abbreviated "yo," Windows 
changes the input language because it thinks I'm writing the Spanish 
word "yo." I don't remember where you go to change that. I know I did it 
for Office, but I don't remember if I did it for Windows in general.


Anyway, when the input language is not the default system language, the 
system behaves normally when you press the left alt key, but it adds 
ctrl when you press the right alt key. In other words, when my input is 
set to Spanish, pressing left alt+F4 closes the current program, but 
pressing right alt+F4 is like pressing ctrl+alt+F4, which may be my 
Firefox hotkey.



On 1/6/2019 5:53 PM, Samson Perera wrote:
> Hi friends,
> I came across a strange problem on a friend’s laptop, using Win 10 and
> Nvda.  Every time I press Alt+F4 to exit a program instead of closing
> the program it opens Firefox.  And it has not been designated as a
> shortcut key.  Wonder if someone can figure it out.
> Thank you
> Samson.
>
>
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