"VNES" to run emu with Java Applet from browser
Installation is unnecessary, it is a site that you can use the NES emulator just by accessing from the browser.
Details are as follows.
According to the description of the site, Firefox is most optimized and seems to be comfortable to use. The cursor key directly corresponds to the cross key, the B button is assigned to the "Z" key, and the A button is assigned to the "A" key. The start button is the "Enter" key, and the select button is the "Ctrl" key.