No sound from head phones

Hi, I have the Satellite P775-s7236. My OS is Windows7  64 bit. Audio Card is Realtek. I use the latest vers. of Firefox.
My laptop manual says that I can use head phones but I have not been able to do it.  I have installed all of the latest drivers, incl. Bios.
When I open the Mixer in the Volume Control, I only get the the Speaker Icon, System Sounds Icon and Firefox Speaker Icon. There is no Headphone icon. I have purchased new headphones and they work well on another computer.
In the Volume Mixer I have changed the speaker icon to the headphone icon. Nothing has helped so far. The laptop speakers work fine and I get sound everywhere except in any U-Tube Videos.
I have gone through all of the settings I can think of but can't seem to change anything. Shouldn't I have a headphone icon in the Volume- Mixer?
If you have any suggestions, I will very much appreciate it. Thanks in advance, Ann

Update!
Suddenly it's working!!  Have been trying for days.... Don't know exactly what fixed it...Have deleted and disabled a number of Firefox  Add-on's.  Headphones are working great! Now the slider for the Firefox Icon in the Volume Mixer is working well.
Hey, I even get sound on U-Tube now!
Maybe this might help someone with the same problem...

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