If you are a fan of Portable Firefox Edition, then this one is just for you.
Mozilla Firefox, Portable Edition is the popular Mozilla Firefox web browser bundled with a PortableApps.com Launcher as a portable app, so you can take your bookmarks, extensions and saved passwords with you.

You may still need to perform a little about:config tweaking to get your extensions working with Firefox 3.5, but apart from that the portable version looks like it’s ready to go.

Now you can use portable edition of Firefox 3.5

Read More: Download Portable Edition of Firefox