I had to copy the QuickLook folder from the application bundle to my ~/Library folder, then it worked great.

All I want from an app like this is 1: renders finder thumbnails, and 2: consistently opens files. Unfortunately I'm not really getting either. It opens perhaps 3/4 of the webp files I use which is a headache for my workflow and means I'll probably just switch to Photoshop to view these files.I can't tell if they mean to support thumbnail previews or not (some reviews say they have it) but it is certainly not working for me so that's a bummer.Same for Quick Look which the developer says they support - it is not working for me.

Takes a long time to load images on quick view if it loads at all. The application has to be opened manually to view an image and to close an image, the entire application has to be closed since the close and minimize window buttons are non-functioning. It is impossible to cycle through images.

Allows you to open and look at webp image files, plus webp files now show thumbnails in the file system, exactly what I wanted. Works with quickview too! Great job developer!