A firefox extension will be great!
Make a firefox extension so that we can make pdf without visiting the site each time.
Have a look at the bookmarklet on the home page at pdfmyurl.com.
Drag the “pdfmyurl” bookmarklet to your bookmarks bar, and then surf with firefox to a site. One click on the bookmarklet, and the page your on downloads as a pdf. This also works for other popular browsers. Let us know if this is what your looking for.