From some users who use legacy mice which supports only vertical wheel,
we have a request to support horizontal scroll with vertical wheel
operation with a modifier.
https://bugzilla.mozilla.org/show_bug.cgi?id=143038
Now, legacy add-ons have gone since 57 and it may be difficult to
override default action of wheel events with WebExtensions, it is the
time to support horizontal scroll with vertical wheel operation with
Shift key.
This will be enabled in default settings except on macOS. The reason
why we don't need to use this feature on macOS is, macOS generates
horizontal wheel event if user uses legacy mouse and pressing Shift key.
And default action of wheel with Alt key is changed to history
navigation which is default action of wheel with Shift key in current
release build.
So, now, we have consistent behavior between Firefox for macOS and the
others.
Note that this feature won't be exposed to attributes of "wheel" events.
This is just a default action change and same behavior as Chrome.
--
Masayuki Nakano <masay...@d-toybox.com>
Software Engineer, Mozilla
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