How to disable accidental trackpad input in Yosemite? The solution to this problem in previous versions of OS X was a checkbox in the trackpad preferences that said "ignore accidental trackpad input." That option is no longer there in Yosemite.

Is it still possible to enable it, and if so how?
I changed "Click" to "Firm" in the menu. 

System Peferences > Trackpad > Point &amp; Click

It seems to have helped.