What’s with all the script errors you say? I run Firestorm viewer and many times I will see script errors flood my screen. Most are avatar attachment errors for their HUDS. You don’t even have to be wearing an attachment with a HUD to see these errors, anyone on the region can throw these script errors and you will see it.
If you would like to turn them off it is a simple preference choice
With Firestorm-->Preferences-->Notifications-->Objects and Scripts
Just untick Report Script Errors
For Singularity Viewer-->Preferences -->Adv Chat-->Spam-->Block All Dialog-->From Scripts
You now should be good to go. Coders please remember to undo these settings, if you need to see the errors when working on scripts.