Why is New UI Windows Vista mixed with LGB rainbow????

[albuser]

Please stop with the slop updates like AI and awful UI. Thanks.

[dftf]

You can undo it immediately in your current Firefox with these actions:
URL bar -> about:config -> ENTER -> accept warning -> search nova ->
double-click line "browser.nova.enabled" to change to "false"

You can then grab the previous theme at this link:
https://addons.mozilla.org/firefox/addon/firefox-proton/  

Longer-term though, move to the 153.5.0 'ESR' version of Firefox to avoid the new UI for a year.
Download link at: https://tips.navas.us/2026/10/firefox-ui-debacle.html