I use the style editor on firefox and lately it cuts off the background image and it's impossible to to code without the image. What are some free programs or apps I could use? Thanks

not sure what you mean? i just type the code directly into the text box, and use 'inspect element' when i'm not sure what something's selector is.

if you want to save your code externally just in case, you could use a basic word processor (just make sure it's not auto-replacing ' and " with curved quotes as that will break the code), or a program like bbedit (formerly textwrangler) or brackets (which i am now in love with tbh).