Tried messing about with the preferences and it is TOTALLY FRUSTRATING!!! Using ALWAYS override really messes things up. ALL background images & other images get blanked out. FireFox is really degrading! Makes one want to switch to CHROME!

Sounds like you have the same results after a update, Switch: people say that in their forum also. https://www.howtogeek.com/334111/firefox-quantum-isnt-just-copying-chrome/ https://www.howtogeek.com/333230/why-firefox-had-to-kill-your-favorite-extension/ Please see Themes : https://addons.mozilla.org/en-US/firefox/themes/ Please know That Firefox is fully Customizable by you : https://www.howtogeek.com/334716/how-to-customize-firefoxs-user-interface-with-userchrome.css/ and https://www.userchrome.org/ https://www.userchrome.org/what-is-userchrome-css.html https://stackoverflow.com/questions/6165472/custom-css-scrollbar-for-firefox Follow the links around, Not all Code is in 1 Place, https://www.accessfirefox.org/Firefox_Accessibility_Themes.php https://www.accessfirefox.org/Theme-Font-Size-Changer.php https://github.com/Aris-t2/CustomCSSforFx/issues/2 replace 2 with 1 Note : there is a sub Reddit/Firefox for code also. https://github.com/axydavid/FirefoxUI/blob/master/README.md https://github.com/wilfredwee/photon-australis The Screen Shot you supplied shows Black Theme and seems in order. The Search Page is not. Something is making the text of Search Highlights not readable. It all should look like the one you Clicked. No idea what did that. Would think it is something you have done or is done by Start Page. Please let us know if this solved your issue or if need further assistance.