Toggle darkmode
Adds a button to enable or disable global dark mode. Manual configuration is required since the default colors are still black text on white background.
What is Toggle darkmode?
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Summary
To edit the used colors go to Firefox Options ->Language&Appearance and hit the Colors... button. While there modify the background color to something dark and the Text color to something light. Might want to make unvisited link colors slightly lighter blue also.
Unfortunately Android doesn't expose these settings, but you can do the same thing via about:config. Edit the prefs "browser.display.background_color" for background and "browser.display.foreground_color" for text.
All this extension does is is add a button to toggle the preference that tells Firefox whether to always or never use these override colors.
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Safety
Risk impact
Toggle darkmode is safe to use. It does not request any sensitive permissions.
Risk likelihood
Toggle darkmode is probably trust-worthy. Prefer other publishers if available. Exercise caution when installing this add-on.