Hi Thank you for your question, great to hear that you are trying out some of the Test Pilot experiments. As the name may suggest, Test Pilot projects are experimental and are a work in progress. As such, there may be one or two unresolved issues that we are looking into fixing if the feature is included in a future release of Firefox. Are you using any other add-ons? (You can find these listed if you type '''about:addons''' into the address bar and select '''Extensions'''). It would be useful for the team developing this add-on if you could supply details of any that you are using that may be causing a conflict. I hope this helps. Thank you again for using Test Pilot!