I had no problems at all with this application. Everything worked that needed to work. I really like that I was given the opportunity to delete the extension after it was used to provide feedback to Dropbox. Being concerned about that issue almost made me reluctant to provide feedback using UserTesting. It would be good if they (Dropbox/UserTesting) mentioned this up front.

Firefox does not allow my computer to do things usertesting software wants to, like access microphone and screen functions. I do not know how to overcome problem.