Hi Folks if you have found that Utools is suddenly not available in Firefox - here is what you can do - note the normal disclaimer that you make your machine more vulnerable by doing so. So your call...

In Firefox type in the browser window:

about:config

Then Scroll ALL the way to the bottom of the page find these two entries
xpinstall.signatures.required
xpinstall.whitelist.required

By clicking on them you can change the status from True to False - restart FF and Utools should now work