Though Firefox can set a series of tabs as your “homepage” (select “Use Current Pages” from the preferences menu), this free add-on (shout out to all the free software coders out there) gives you the capability to choose when to open which homepage.

State, for example, you like to read the NYTimes on days when you work, but you prefer Google Reader on Saturdays and your church’s weekly bulletin on Sunday mornings. This program, as you may have already assumed, does just that.