my screens are black and I can't read
I used preferences because all my printing was in color even through I chose black and white. Unfortunately, I changed something that had dark blue and purple for black and it changed my screens to black. Can you help me get it back. I looked at preferences again to change, but I can't read. I deleted Firefox and downloaded again, it doesn't help.
Thank you,
dlmd
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Try Firefox Safe Mode to see if the problem goes away. Firefox Safe Mode is a troubleshooting mode that temporarily turns off hardware acceleration, resets some settings, and disables add-ons (extensions and themes).
If Firefox is open, you can restart in Firefox Safe Mode from the Help menu:
- Click the menu button
, click Help 
and select Restart with Add-ons Disabled.
If Firefox is not running, you can start Firefox in Safe Mode as follows:
- On Windows: Hold the Shift key when you open the Firefox desktop or Start menu shortcut.
- On Mac: Hold the option key while starting Firefox.
- On Linux: Quit Firefox, go to your Terminal and run firefox -safe-mode
(you may need to specify the Firefox installation path e.g. /usr/lib/firefox)
When the Firefox Safe Mode window appears, select "Start in Safe Mode".
If the issue is not present in Firefox Safe Mode, your problem is probably caused by an extension, theme, or hardware acceleration. Please follow the steps in the Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems article to find the cause.
Once you're running in the Firefox SafeMode, see this support article.
https://support.mozilla.org/en-US/kb/refresh-firefox-reset-add-ons-and-settings