Easily switch text (foreground) colors to yellow/white with black background. The plugin offers three modes: yellow on black, white on black and back to web page's defaults.
The addon will place small button to the addon bar (bottom left) depicting letter "A" on black background. When clicked, the page's color mode will be switched to the next one (mentioned 3 modes are rotating).
Alternatively, you can use the item in the context menu (mouse right-click on a page) or use keyboard shortcut ctrl+alt+b to rotate the color schema.
The plugin manipulates settings available in Preferences -> Content -> Colors, if any problems, just uninstall it and edit the preferences therein to your liking.
Comments and ideas welcomed.