Firefox has a built-in feature to check for color profile information in JPEG images and adapt the display to the color profile for your monitor. Sounds as though that is not working well at all.

You can disable the "color management" feature and see whether you get a better result. Here's how to try that:

(1) In a new tab, type or paste about:config in the address bar and press Enter. Click the button promising to be careful.

(2) In the search box above the list, type or paste gfx and pause while the list is filtered

(3) Double-click the gfx.color_management.mode preference and enter your preferred value:

• 0 => disable color management (try this)
• 1 => color manage all graphics
• 2 => color manage graphics with profile information specified (default)

Any improvement?

Thanks! I tried it but it didn't do anything, was thinking maybe it would after a reboot? I'll let you know!

Thank you very much! It worked after a reboot! (I should've posted this question months ago!)