User blog comment:Undead.exe/Breakpoint 0, Typography 0/@comment-86.218.28.29-20150520090909/@comment-5454372-20150520144758

Apparently not; I just tried it and got this message:

"The modification you tried to make was aborted by an extension hook"

Edit: also just thought of trying to put some CSS into the guest I was controlling from this logged in account, but I forgot that you can't edit a guest's settings like that.

Not as a standard user anyway -- not too sure what'll happen if a local admin tries that on their own wiki...