Steps to replicate the issue (include links if applicable):

• log in, using Vector 2022 and the configuration described below
• open a random article on the French Wikipedia, for exemple this one.

What happens?:
the user reported that when he is using Vector 2022 (or when he change skin from Vector to Vector 2022) the main menu (sidebar) disappears but no burger menu is present instead.
He probably has problems with the Tools menu too, he can't see it nor found the "Tools" when collapsed (talk).
He can't see where are collapsed menus despite being helped and provided with screenshots.

What should have happened instead?:
He should be able to find links, menus and icons using Vector 2022.

Software version (skip for WMF-hosted wikis like Wikipedia):

Other information (browser name/version, screenshots, etc.):

He reported this issue among other issues which beginned when Wikipedia changed his appearance ("ce désagrément certain a dû apparaître au moment où Wikipédia a modifié sa présentation")
This user has low tech skills and has other problems especially with JS (probably Javascript deactivated)

His configuration: Mozilla Firefox iMAC OSX version 10.7.5, screen 21.5 inches