Firefox uses default black on white colors for every web form on the Internet. What many users do not know is that it is possible to change the web form colors in the web browser which is helpful to make them more eye friendly for instance.
The color settings are available as about:config parameters. Firefox users who want to change them need to enter about:config in the address bar and enter browser.display in the filter on top. This displays the relevant parameters in the listing.
Colors are represented by hex codes, a good overview of available colors and their hex codes is available at the Color Wheel website.

browser display form colors
browser.display.background_color defines the standard background color of all web forms that are displayed in the web browser. The default color is white (#ffffff)
browser.display.focus_background_color defines the background color for the active web form on Internet pages. The default value is green, the parameter is inactive however and needs to be activated by setting browser.display.use_focus_colors to true.
browser.display.focus_text_color defines the font color of the focused form, the form with the cursor in it.
Please note that the changes become active immediately. A good way to test them is to use the filter form on top of the about:config page.

browser display form colors
Changing web form colors in Firefox is a great option for users who are not happy with the standard colors, could be an option to make the colors easier on the eye or fit with the browser’s theme.
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Thanks for this useful bit about form background colors, I am implementing it right now!