See:

• https://support.mozilla.org/en-US/questions/682742#answer-19288

The suggestion was for yahoo not ask -- the solution list said go to tool and remove it, however when ask hijacked my Firefox, there is no longer a tool option in the menu. I can send screen shots with snagit if you like.

There is no tool, there is no profile, no options to change my main page left in drop down menus, they have removed almost every method/path that I would normal use to remove them, which leads me to believe it was deliberate.

Try hit ALT+T