One of the things MS does now in File Explorer is, when a file is selected to be renamed, only the "name" portion of the file is highlighted (left of the ".") to be changed. The .extension portion is not highlighted. This is a big time saver as it reduces clicks and cursor postioning.
When I save a file in the browser and need to rename it, the entire filename is highlighted, thus extra clicks and cursor positioning is required to highlight only the name portion to be changed. Please modify this functionality in Mozilla products to be consistent with the way Windows File Explorer handles it as it is a big time saver when renaming files. Thank you!