Let's say I'm browsing some web site's folder which includes images: For instance, there is a picture on the following address:
http://www.example.com/images/gallery/8392/13.jpg
It's not possible to view the gallery folder (403 Forbidden) here. For a quick exploration I'll have to type 01 or 1 instead of 13, and then 2,3,4 etc. Since this is manual, mostly it's back breaking. Is there a trick or add-on for Firefox to automate this process?