The strangest thing. After this major Win10x64 upgrade/update, FF is giving me fits. The most important extensions for me are the any that "zoom" because of monitor resolution, and vision issues. Now, any thing I use for Image zoom, thumbnail zoom, regardless of the site I'm on just will not work. I've tried re-installing them and checking the configuration/options and nothing I do has any effect. The page/text zoom works OK, it's just anything associated with images of any kind fails. I've always been able to hover over an image and have it zoom in. Some of the most frustrating are video thumbnails where I get a "blank" thumbnail. Any help in sorting this out will be appreciated. If at all possible, I want to avoid a reload/refresh of FF.