Facebook announced an update related to its photo viewer, from now onwards, you can now see photos in high resolution by default and also will allow you to enter a full screen gallery mode by clicking arrows in the top right corner of a photo. The maximum resolution the photo viewer can handle is 2048 x 2048. Now the photo viewer will automatically display photos in the highest resolution possible. On a large display, this can be up to 4 times bigger than before. If you’re using the latest version of Firefox or Chrome, click the arrows at the top-right corner of a photo to expand to fullscreen.
(Image Source: Facebook)