Hi cbrew,

There are a few options that may be considered here, so I will give brief details of the ones I am thinking could help.

The OS itself may have options that help, and you may as you have tried select to use chosen settings but these simple solutions are often unsatisfactory.

I note Accessibility features in Firefox - Make Firefox and web content work for all users#w_using-a-high-contrast-theme says:

Using a High Contrast Theme

Firefox automatically detects if you are using a High Contrast theme and displays everything in your high contrast color scheme. This overrides all other other browser or web page settings, and it affects the Firefox interface itself (all menus, windows, and dialog boxes) and the content of any web page you visit. 

That may well be worthwhile trying as an alternative to simply changing font size and colour.

THIS MAYBE THE BEST IDEA
There is a popular add on called No Squint, it takes quite a bit of setting up to work properly but it is very powerful.

• https://addons.mozilla.org/en-US/firefox/addon/nosquint/
• read also support note https://urandom.ca/nosquint/

Additionally it is possible to change settings that includes the Firefox User Interface, it is fiddly, and will probably only be worthwhile if using No Squint. It involves setting the preference layout.css.devPixelsPerPx

• usual values to try from say 1 to 2 or 3; in say 0.2 steps
• and notes on setting procedure http://kb.mozillazine.org/About:config

You may also be interested in

• Accessibility features in Firefox - Make Firefox and web content work for all users
• and mainly relating to screen readers an archived article Assistive technology compatibility
  • with discussions 1 , technology compatibility/discuss/1996 2 and another archived article Firefox 3 with Screen Readers FAQ
• http://accessfirefox.org/

See also:

• http://support.apple.com/kb/HT1343#odd10

I have tried every suggestion but nothing fixes the problem. I downloaded NoSquint and it had no effect. This is a simple problem. All I want to do is make the font color for text white everywhere on a web page. Firefox ignores my selection for text font color in text boxes such as the search box on the Google home page. How can this be fixed? Thanks much.

Try code like this in the userContent.css file below the default @namespace line.

• http://kb.mozillazine.org/userContent.css

The customization files userChrome.css (interface) and userContent.css (websites) are located in the chrome folder in the user profile folder.

• http://kb.mozillazine.org/Editing_configuration

button, input, select, select > input[type="button"], textarea {
 -moz-appearance: none !important;
 background-color: black !important;
 color: white !important;
}

Extrapolating cor-el's answer worked for me. Here's what I did:

Install the firefox Add-on Stylish:

https://addons.mozilla.org/en-US/firefox/addon/stylish/?src=external-userstyleshome

Goto Stylish's companion website:

http://userstyles.org/

Search for Google on userstyles.org and install the following theme:

Black Google 2012 by Panos

http://userstyles.org/styles/61377/black-google-2012-by-panos

Once you install Stylish its easy to install Stylish themes from userstyles.org

My main problem was with the Google Search box, with nothing visible (black text color on black background)

To add more sites where you want this "Black Google" theme to work, go to firefox's Add-on manager (Ctrl + Shift + A), and click Edit next to this theme. You'll find a list of google sites at the top, just add whatever you want to these.