https://www.microsoft.com/en-us/edge/features/magnify
MS Edge has a great feature when you can enlarge images by double tapping Ctrl.
"With Magnify in Edge, you can easily expand an image to view it in more detail. You no longer need to open new tabs or download images to see larger versions. Just right-click the image and choose Magnify or hover over the image and tap the Ctrl key twice. "
I'm currently using Imagus Reborn extension on Firefox which is great. But I figure if MS is able to integrate the functionality into Edge, maybe Firefox can too!