I have been searching forums on Firefox and the web at large to find an actual solution.
My search bar has been hijacked by Yahoo, probably in a sneaker add-on or something coming in with a download. It has taken over my search bar so that I cannot switch back to Google, which is what I had selected in the drop-down menu before the hijacking. It also forces me (because of this) onto a Yahoo search page for any search I do.
The reason I need expert help:
All the posted solutions I found online for "yahoo has taken over my search bar" talk about removing Yahoo by going to Tools>Add Ons and then simply locating it and removing it. The issue is though that nothing shows up named 'yahoo.' I also tried searching my computer for 'yahoo' and removing everything that came up with that name, but the problem persists. I think that Yahoo put a sneaker/hidden program or add-on or whatever on my machine so that I can't find it to remove it. This has happened before, and I don't remember exactly how I got rid of it next time.
I trust this community will read this topic post thoroughly and not give me instructions to remove it from Tools>Add Ons, etc., which doesn't work. This problem requires a higher level of savviness.