"The only major non-WebKit browser", if it exists, is a title that would have to go to Chrome, and it would require you to consider Firefox a "minor non-WebKit

"The only major non-WebKit browser", if it exists, is a title that would have to go to Chrome, and it would require you to consider Firefox a "minor non-WebKit browser". At <5% (on par with Opera circa 2012), that wouldn't necessarily be an inaccurate way to describe it.