What do you suggest ? In all good faith ? Seriously ?
If this is a regular occurence with his edits, I do not see that it
matters much whether he does it deliberately, does it out of stupidity,
has a virus, or suffers from a browser bug (that nobody else with
Firefox suffers from): It's his responsibility to make sure that his
system is compatible with Wikipedia.
If he cannot do so, he should refrain from editing. If he will not do
so voluntarily, his writing privileges should be removed.
What would be the alternative? Somebody (or several somebodies) would
have to constantly clean up after him. If you find people for this
diaper duty, fine, but I'd view that as a waste of editor resources
that could otherwise be put to better use.
The openness of Wikipedia menas that every participant becomes
responsible for the project's well-being. I do not see how people who
do not want to shoulder their share of this responsibility can be
reasonably accommodated in Wikipedia.
Hope this helps
Jan