how to uninstall, it doesnt work

[me]

I installed it. It didnt open, there was an error box. I cant uninstall it. How do I do this please? it isnt on the list of programs in my uninstall programs section.
Also, I needed an xpi viewer to use this so I also downloaded the free bie on your web page. This was full of spam and changed the search to Bing despite unchecking the box. Right pain

[barbaz]

Uninstall what? NoScript? FlashGot? One of the Uniblue products Giorgio advertises? something else?

If you mean NoScript:
open Firefox, go to Tools > Add-ons Manager > NoScript > Remove > Yes, remove ALL protections

FlashGot can be uninstalled from the Add-ons Manager as well.

Uniblue products are 3rd-party than us, so you would be best off to refer to their support to get help removing it.

Also, I needed an xpi viewer to use this

Actually you don't, and anyway you've likely already got the ability to inspect XPIs: Edit the .xpi extension to .zip , then unzip it using whatever you prefer for unzip .zip files.
Do the same for the inner .jar file if any (rename .jar to .zip,...)

Also,

I needed an xpi viewer to use this so I also downloaded the free bie on your web page. This was full of spam and changed the search to Bing despite unchecking the box. Right pain

What web page?
"We" do not distribute a "XPI viewer". It's probably malware. See General Troubleshooting Instructions #2 for some anti-malware suggestions.