procstat -v firefox Transforms

File Sources

Key	Source
This file was not created by transforming another file.

Name	Key	Supported	Transform	View
Profile (400px × 400px)	profile	No	None	None
Pinboard (280px × 210px)	pinboard	No	None	None
Thumbgrid (100px)	thumbgrid	No	None	None
Preview (220px)	preview	No	None	None
Workcard (526px)	workcard	No	None	None