Rated 5 out of 5 stars

SOLUTION FOR THE TIME BEING.

1) Get Autohotkey
2) Create the following script:

#IfWinActive ahk_class MozillaWindowClass
;MouseGetPos, [OutputVarX, OutputVarY, OutputVarWin, OutputVarControl, 1|2|3]
~WheelDown::
MouseGetPos X, Y
if ( X < 225 )
SendInput ^{Tab}
Return
~WheelUp::
MouseGetPos X, Y
if ( X < 225 )
SendInput ^+{Tab}
Return


Adjust the X value to the width of your vertical tab bar (if you are using a horizontal tab bar (you shouldn't), change to Y < 33 or similar. Auto-run the script with Windows. Voila! My life is complete again.