update: weird color have .png, .webm and, probably, .tiff .jpeg files looks normally.

You can try to disable hardware acceleration in Firefox.

• Options/Preferences -> General: Performance
  remove checkmark: [ ] "Use recommended performance settings"
  remove checkmark: [ ] "Use hardware acceleration when available"
• https://support.mozilla.org/en-US/kb/performance-settings

Close and restart Firefox after modifying the setting for changes to take effect.

• https://support.mozilla.org/en-US/kb/troubleshoot-extensions-themes-to-fix-problems

You can check if there is an update for your graphics display driver and check for hardware acceleration related issues.

• https://support.mozilla.org/en-US/kb/upgrade-graphics-drivers-use-hardware-acceleration

Done.

Update graphic accelerator driver, reboot - no effect. Uncheck checkboxes "Use recommended performance settings" and "Use hardware acceleration when available", then restart Firefox - no effect. Swear, reboot - no effect anyway.

Well, at least I update video driver :)

about:config -> gfx.color_management.mode -> 0 -> Restart browser