I can't see the code without edit access? I go to Tools -> Script Editor, click, and it does nothing. No error even. (Happens in both Firefox and Chrome.)
Yes, me too, I also wanted to see the implementation. I did submit a "Problem Report" on why you don't get visual feedback when opening the script editor and getting an error.
That's weird. You should be able to copy the document and then view the source in your copy.
Thanks, making a copy works. But it should show you an error like "You need permissions to edit this document" or something.