You know how news sites often have a "print" version of each article? It's typically a slightly modified URL that brings up the whole article in a form suitable for printing — on a single page, usually without ads, and sometimes without images. I don't have an example handy but I often get such links in my RSS feeds.
I appreciate the nicer looking single page, but some of these sites automatically bring up the print dialog, presumably as a convenience to save me a click. I almost never want to see the print dialog, so I'd like to have a Safari extension that suppresses this behavior.
I'll have to look in my RSS archives later for an example that I can dissect. Offhand I'd guess they're doing something like
onLoad="window.print();". Maybe I can write the Safari extension myself.