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