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Possible Duplicate:
Change the white background in webpages to another color.

Is there a Firefox addon which makes every site's background black and text white?

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marked as duplicate by Sathya Apr 25 '11 at 16:23

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

up vote 4 down vote accepted

In Firefox, go to Tools > Options > Content and click on Colours button.

Select black for the "Background", white for the "Text", and clear the checkboxes near "Allow pages to choose their own colours, instead of my selections above" and "Use system colours".

alt text

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seems to me that this is the only solution, thanks – Sergey Apr 24 '11 at 16:37
@Sergey: You're welcome. – Mehper C. Palavuzlar Apr 24 '11 at 16:50
but then you loose a lot of styling by the website , stuff starts looking pretty awful – Shekhar Apr 24 '11 at 18:42
you could try fiddling with greasemonkey , – Shekhar Apr 24 '11 at 19:08

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