can somebody please make me a script for greasemonkey that automaticall adds ?.jpg to every URL?
i've heard it's really simple, but i can't do JS for my life!

Is that to every link, or to the location of the window? To add it to every link, the following would work...

for (i = document.links.length - 1; i >= 0; i--) 
  document.links[i].href += "?.jpg"

how would i install this into greasemonkey?

so like if i type www.google.com/ then it would become www.google.com/?.jpg

So you want whatever address you go to to have ?.jpg appended to it? If that's the case, ignore my previous post .. you'd want...

window.location.replace(window.location.href + "?.jpg")

To install this in greasemonkey, right click the monkey face in the corner and select "New user script...". Fill in the details, and then paste that line into the script. Save it and then it should simply work.

thank you so much!

May I ask why you want ?.jpg on every url?
Also add *?.jpg* to the list of excludes or else your url bar will get infinitely filled up with ?.jpg's.
Or, without adding it to the list of includes, just replace that other line of script with this, and it will only run on the pages without ?.jpg in the url already

if(location.href.indexOf("?.jpg") == -1) location.href += "?.jpg";

right now i have to add specific sites, is there any way to do that for all sites?

Add

*

[...] or else your url bar will get infinitely filled up with ?.jpg's.

lol znerp

Im not sure how it is an useful script, but ive put JoeSimmons' code into a .user.js file so you can install it without having to do it yourself :P

http://userscripts.org/scripts/show/31681

... why?

So did I:

http://userscripts.org/scripts/show/32316