Currently it supports only RAR, ZIP and ISO format but that should be enough as they are the 2 most popular and common formats being used today. Archview adds itself to the stats bar and becomes active when the user clicks on a zip or rar link. It displays the contents almost instantly and presents the files of the archive in an XML or HTML interface. And what’s more, it even lets you download individual files for an archive, now no need to download a 10 MB archive for a file of 100 Kb that is inside.
The future version will also add support for the 7z format. It supports Firefox 2 and Firefox 3. It is definitely a great add on that can save you a lot of bandwidth.

Download Code:
https://addons.mozilla.org/en-US/firefox/addon/5028