I know it has been mentioned before about turning off your Javascript to help solve problems with TT and your browser and this seemed like a bad solution but until Teamtalk brush up on their Javascript and sort out the problem (for your own good, I would make this a priority). .
Anyway there is a Firefox add on called YesScript that will turn off Javascript for individual websites. It’s easy to do and means you don’t have to turn it on and off constantly when you need it for another site.