I found a bug in your Firefox for iPad in Version 125.2 and earlier that has been recurring. Once I establish Dark Mode in one tab, (Tab 1) via system dark mode on iPad settings and Firefox Settings, When I open a new tab,(Tab 2) it will be in Light Mode. When I switch Tab 2 to Dark Mode via Firefox settings, it will automatically switch Tab 1 into Light mode. If I switch all odd # tabs into Dark Mode, all Even # tabs will be a weird Light Mode but with the videos in screen paused in a strange negative photo view. After reading up on all websites, forums on Mac, iPad and Firefox, it seems this is a Firefox Bug. To correct this, all tabs opened in either light or dark mode should be the same mode as the new tabs opened. My iPad update has been updated to the latest version 17.4.1 iPad 9th Gen.