Rated 5 out of 5 stars

It's an excellent, must-have extension! One of the most helpful forums too (http://custombuttons.sourceforge.net/forum/index.php) where people do actually help any newbie or a pro. Sometimes might need to wait a day for an answer - no prob, i guess it means those people are alive and have better things to do than hang in forums 24/7 ;-)
But they ALWAYS answer and help.
A new sortable database with hundreds of buttons (https://dl.dropboxusercontent.com/u/57898370/CB%20Database/.CB_Database.html). If you find one there that doesn't work, just link to it in the forum and somebody will fix it or will make a new button for you.
To all the 'nay' sayres, I see all that 'not working!' whining comes from people who couldn't even figure AMO is not a place for posting bugs, the extension forum is (read this site review guide just above your review textbox(!): "...Please do not post bug reports in reviews..."). Or people who appear pretty impatient, like their life depends on some browser button!
To the rest: this is one of those extensions that makes your browsing uncounted times better, saves time, space, clicks and makes you smile!

This review is for a previous version of the add-on (0.0.5.8.1-signed.1-let-fixed). 

Rated 5 out of 5 stars

There's probably a button available for anything one can think of to simplify the browser use and eliminate some extensions. The dev build 0.0.5.6 works perfectly well with Fx12, Fx13b. Get it here - http://custombuttons.mozdev.org/devbuilds.html

This review is for a previous version of the add-on (0.0.5.5.1-signed).