is this a fire hazard?

If it is, tell me soon, 'cause I'm about to burn the place down.

I have lined my two kitchen windows with tinfoil. This has happened for several reasons:

(a) On top of getting beaten with full afternoon sun in a 100 degree heatwave, they also get the heat from a huge patch of black tar roof directly outside.
(b) I don't have shades. I have those four dollar roll up blinds from Ikea, which don't do shit for light blockage, but it keeps the neighbors from watching me eat topless at my kitchen table. I'm not kidding.
(c) I suppose I could go buy shades, but because they'd be the expensive room darkening kind (and foil costs about two dollars for a huge roll when you buy store brand), I'd rather have the twenty bucks to take the train to the city tomorrow to see Charles.
(d) It works for cars, so why not for my kitchen?

If I am causing some kind of potential accident involving exploding glass or global warming, could someone please email me? Kiss kiss.