Hello JDTravel,
Yes, it seems abandoned. I’m not the maintainer of this plugin, but I maintain WebP Express (https://www.ads-software.com/plugins/webp-express/).
As Mozilla and Microsoft have now jumped the webp boat, it seems possible that webp is going to replace jpeg and png as the preferred format. It seems that the future question should not be: how do we serve our jpegs in webp for webp enabled browsers, but rather: how do we serve our webp files as jpeg/png for older browsers. But with this amazing library (https://webpjs.appspot.com/), we won’t even have to do that. We can simply just add the javascript, and we have webp support for older browsers. How amazing is that?
But with WordPress, you aren’t even allowed to upload webp files in the media library. Without being able to insert webp images, adding the javascript has no value, it seems. Or am I missing something?
A solution could be a .htaccess 301 redirect from jpg/png to existing webp in same folder. If webp does not exist, the solution could be to redirect to an image converter, which generates the webp – like its done in WebP Express.
Redirection however produces another request. A better solution would probably be to replace the image src in the HTML. But that is complex.
What do you think?