Update: Apologies. I just realized, a first click on "Trusted" only enables the temporary allowance. Only a second click makes sure this is a permanent Trust setting. Actually, I like this idea! And this also seems to work now. Maybe it would be better if the user gets an CLEAR introduction after installing NoScript (the way how it works totally makes sense, but you should explain it to the user)

Please ignore my old feedback:
The add-on does what it says. However, my settings which URL I trust sometimes don't work or the trust setting is forgotten on the next day and I have to enable trust for the URLs again! This is really annoying and makes this tool almost unusable.
Also sync across my Firefox browsers on different machines does not seem to be supported (but that would be still OK, if NoScript would at least SAVE my local trust settings!)