.

Why don't you look-up and find a theme for FF that you like ?
 

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System One

  • OS
    Windows 8.1 Pro
    Computer type
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    CPU
    AMD Ryzen7 2700x
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    Asus Prime x470 Pro
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@TripleR

Menu>>Tools>>Options>>Content Tab>>Colors>>Allow Pages To Choose

I use a high contrast theme and Pale Moon browser, although I don't allow pages to choose. I can and it works on my PC.
 

My Computer

System One

  • OS
    win 8.1
    Computer type
    Laptop
Try in FF Menu->Settings->Content->Colors->Replace colors, specify the page to the selected color above me: Never
 

My Computer

System One

  • OS
    Windows 8.1
    Computer type
    Laptop
Don't know if this will help but you can try the Classic Theme Restorer extension.
It has color settings.
 

My Computer

System One

  • OS
    windows 8.1 64bit
    Computer type
    PC/Desktop
    System Manufacturer/Model
    HP Pavillion 500-223
    Memory
    8 gig
    Monitor(s) Displays
    SAmsung SyncMaster 2033
    Screen Resolution
    1600x900
    Mouse
    Logitech G500S
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    Firefox
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