Many white backgrounds render black. This is makes it impossible to read pages.
Here are some examples:
Here are some examples:
https://www.quora.com/Can-a-fan-be-made-a-renewable-energy-device-where-it-motion-can-generate-energy-that-will-be-used-be-the-fan-itself
https://shifter.no/slushguide/
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Please : https://support.mozilla.org/en-US/kb/export-firefox-bookmarks-to-backup-or-transfer and https://support.mozilla.org/en-US/kb/back-and-restore-information-firefox-profiles then https://support.mozilla.org/en-US/kb/refresh-firefox-reset-add-ons-and-settings TEST....... If no issues then Extensions which need to be added back in 1 at a time and tested ..... Or it is your Profile : Make a new one and test ...: https://support.mozilla.org/en-US/kb/profile-manager-create-and-remove-firefox-profiles
Please let us know if this solved your issue or if need further assistance.
Maybe check the default background color setting on the about:config page and in Options/Preferences.
- browser.display.background_color
- Options/Preferences -> General: Fonts & Colors -> Colors