"SEARCH BY IMAGE" STOPPED WORKING.

I'm running Windows 11 Pro on a desktop PC. I have used Firefox "Search by Image" many times and I haven't had a problem in the past. A few days ago the search failed for "some" images and now it fails for any and all images that I drag and drop into my browser. Important: It does work for images on the internet. My problem: (1) I drag and drop an image into my browser. (2) I right-click on the image. (3) I select "Search by Image". (4) I select a search engine. ''Absolutely nothing happens.'' I've tried with various images and various search engines. Still nothing happens. I don't think I'm doing anything different than I've always done. I haven't changed any settings in Firefox. Any ideas?