remove superfish or list it in the main description Rated 1 out of 5 stars

I would give this a 5 star rating other than the hidden "superfish" installation.

To fix the add-on to eliminate "superfish":
download/save the .xpi (uninstall if already installed)
change the extension of the .xpi to .zip and unpack it
edit chrome.manifest and chrome.manifest2 files to remove the "overlay chrome://browser/content/browser.xul chrome://calculator/content/superfish.xul" lines

change the extension of the chrome/calculator.jar file to .zip and unpack it
remove the "content/superfish.xul" file
create a new zip of the .jar contents and replace chrome/calculator.jar with it (making sure to name it .jar)

create a new zip of the .xpi contents (making sure to name it .xpi)

drop&drag into add-ons manager (or use add-from-file) the fixed .xpi

This review is for a previous version of the add-on (1.1.23).