Rated 5 out of 5 stars

Is the address bar of Status-4-Evar able to surpport a relative path photo instead of absolutive path on the sake of making Portable version? I wanna DIY a portable version to approach Safari style.

This review is for a previous version of the add-on (2011.06.28.22). 

Unfortunately, that isn't possible through the S4E preference UI. Relative paths in CSS are resolved relative to the CSS file (which is inside the S4E extension file). But you should be able to do it using the userChrome.css in the profile. Head over to the MozillaZine support topic if you need help.