https://bugs.winehq.org/show_bug.cgi?id=49142
--- Comment #1 from Murray Colpman muzerakascooby@gmail.com --- This looked easier than I thought it might be so I wrote a quick patch. I've tested it in an old version of Firefox (30.0; I happened to already have it installed in a prefix); the old behaviour was to go back and forward in history, the new behaviour is to scroll horizontally. I've submitted it to wine-devel here https://www.winehq.org/pipermail/wine-devel/2020-May/166087.html (sorry, I couldn't get git send-email to work, and I'm not sure but I think Thunderbird might have done something weird with the attachment...)