This may be a Firefox problem, as it started soon after I upgraded to the
new version, but maybe someone knows the answer anyway...
Every once in a while, while I am browsing, Firefox will try to open the web
page as a file (and ask me where to save it.) It will continue to do this
for every link I try to open, bookmark I click, and so on. I found that I
can reset it to normal by pressing ALT. But does anyone know why it starts
doing this in the first place?