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You might want to try this add-on that might do what you are after.
This article will help you to install an add-on in Firefox for Android.
Hi
You might want to try this [https://addons.mozilla.org/en-GB/android/addon/dark-background-light-text/ add-on] that might do what you are after.
This [https://support.mozilla.org/en-US/kb/find-and-install-add-ons-firefox-android article] will help you to install an add-on in Firefox for Android.