Rated 1 out of 5 stars
I tried contacting first but there was no mail listed here. I went to the developers home page and found an address which immediately bounced back as broken.
Anyways, I liked the idea here but there was no icon whatsoever. It wasn't in the toolbars, the statusbar or in the customization window. It simply didn't exist. Ouch!
It seems the extension did not install for you. Possibly it is not compatible with your version of Firefox. Please don't give a poor rating, if the extension is not compatible with your version, and you didn't even get to try it yet. Also please note: there is an older version of this add-on that is more compatible.
Also note that the add-on first appears on the "Add-on Bar", it does not appear on the toolbar.
Please try this version: https://addons.mozilla.org/en-US/firefox/addon/clearallcookiesbutton/
PS: both listed websites do work, maybe you were having connection issues?