Here's a new one...

[cradom]

Looking in another forum (Bike Forums), right-click on a link-open in new tab.
Switches to new tab. Try to scroll. Doesn't work. Jiggle mouse, click on page, get it to scroll.
Back to old tab, THAT one is the one scrolling. What the...
Firefox 33.0, Yosemite (need to change sidebar info) on the Macbook.
Don't think it happens on the iMac. OS bug? Firefox bug? Finger bug?
Brain fart? Any ideas?

 

[McBie]

Definitely a brain fart.

Cheers ... McBie

 

[cradom]

After a while using it, it seems it's only that forum (so far). Hmmm...