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Change the background colour from black to white

When I open Firefox browser and type in a website, all the seach pages comes up wth a black background and white text. Please could someone advise me how to chang the black background colour to white? Screen shot attached

Thank you Les

When I open Firefox browser and type in a website, all the seach pages comes up wth a black background and white text. Please could someone advise me how to chang the black background colour to white? Screen shot attached Thank you Les
Attached screenshots

Chosen solution

hi les, according to your system details you have an addon installed that by the description is responsible for this behaviour: "Dark Background and Light Text". also, unrelated to the question at hand you're using three list-based adblocking extensions (ublock, adblock, ghostery), which isn't a good idea and usually causes performance problems...

Disable or remove Add-ons

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Chosen Solution

hi les, according to your system details you have an addon installed that by the description is responsible for this behaviour: "Dark Background and Light Text". also, unrelated to the question at hand you're using three list-based adblocking extensions (ublock, adblock, ghostery), which isn't a good idea and usually causes performance problems...

Disable or remove Add-ons

I enjoy a dark background for eye strain, but i can not read black text on many web sites and gmail which have no / transparent backgrounds . How can I simply create(?) a white background in FF. FF color controls are so limited.

Also: An Updated and Expanded color adjustments color preferences control panel for all aspects of FF browser would be great. Simply: "Background": Transparent, Black, White, and Alt-color chooser/picker radio buttons

- suffering.

Thanks