Image preview cache issue after restart

I sometimes run into strange behavior when hacking on ComfyUI and restarting it a lot:

- ComfyUI is open in browser
- I restart the server
- I forget to reload the browser tab, so it reconnects to the restarted instance

The thing is—this mostly works. However, the images in "Image preview" will start to repeat from earlier run. I think it's because numbers are re-used and the browser still has the old image cached, but I don't know for sure.

In any case, it would be nice if the UI detected this and automatically reloaded, or did something else to avoid cache collisions.

Browser: Firefox
Version: git 8d694cc