For a general user, it is not possible.
For experienced IT person, you could use Tiny File Manager (from first page of thread about M92 firmware) and delete the website bookmarks. (I do not know where it is stored.)
It also might be possible to remove website bookmarks from firmware instalaton zip file. And reinstall the firmware. It is possible to add files to firmware file, but I do not know if it is possible to remove ones...
In both cases, you should know, what you do. Otherwise you might (in extreme case) brick M92.
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