A Fast Dial user contacted Userlogos reporting that he could not open Fast Dial in a New Tab with CTRL-T.
see here
When he clicked on CTRL-T he got the AVG Yahoo search option instead.
It would seem that the AVG Security Toolbar Firefox Extension is responsible for this.
To resolve this problem please follow the instructions posted on the AVG Site here
A further post on a Mozilla Forum Page about this matter here
Many thanks