steps to replicate the issue:
what happens?:
the sidebar and bottom bar are in white
what should have happened instead?:
they should not be in white
Thanks. Looks like this is about https://en.wikipedia.org/wiki/Wikipedia:Dark_mode_(gadget) . I don't know where its issue tracker is, as that page doesn't provide information where to report bugs. @Volker_E @MusikAnimal @alexhollender_WMF where do you expect bug reports?
This is not a bug with Vector so I suggest raising this on the talk page of the gadget.
This sounds like the Firefox problem. https://en.wikipedia.org/wiki/Wikipedia_talk:Dark_mode_(gadget)#Interface-protected_edit_request_on_23_May_2022_(Change_/_remove_Firefox_hack)
In which case the solution is, update your Firefox version.