Color settings not applied when using Apple Magic Mouse

[WesleyBranton]

A user has reported issues using the add-on on Mac when they have the Apple Magic Mouse (cordless) connected:

I have been using your Custom Scrollbars with my Apple mouse (corded), and it works well. However, I have switched back to my cordless Magic Mouse, and now I can adjust only the width. The colours do not apply to my scrollbars since the change, even after re-saving, exiting and re-starting Firefox.

I'm assuming that the Apple Magic Mouse is overriding the add-on's color CSS in some way. Unfortunately, since I don't own a Mac or have access to one, I won't be able to troubleshoot this issue. Is anyone has access to this equipment and can reproduce the issue, it would be much appreciated if you could find a fix or workaround.

I'm not sure there is a way to fix this in the add-on code, but there may be a setting (in Firefox or on Mac) to prevent the scrollbar colors from being overridden when using the Apple Magic Mouse.