The mouse cursor in Firefox running XWayland doesn't work correctly. It doesn't change according to objects it hovers over (sometimes it gets stuck with text input cursor) and it sometimes disappears completely (I can reproduce it with HTML5 videos, when I hover the cursor over the video element the cursor disappears and never appears again). This draws Firefox on XWayland unusable.
I'm using Firefox 42 and Xorg 1.18.
I'm experiencing the same issue in applications running on XWayland.
Sometimes, the mouse cursor gets stuck with the wrong icon, like the resize window or text input. Other times it just disappears.
I haven't yet seen issues described by OP, but I've noticed that a "wait" cursor (spinner) does not animate if you keep the cursor still, it only animates when you move the cursor. That can be easily seen here:
Move your cursor over the "wait" hyperlink - if you hold still, the spinner does not animate, but if you move it slightly left and right (while still hovering over the "wait" hyperlink), it animates.
This is a duplicate of #1278316
*** This bug has been marked as a duplicate of bug 1278316 ***