How to view individual tiles, and mark as dirty?

It used to be possible, on the main site, to right click on the map, and select `View Image` (in Firefox, or similar in other browsers), and view the tile you'd clicked on. By appending `/dirty` to the end of the URL, the tile would be put in queue for re-rendering. This was very handy, though I understand that it could place excess load on the servers if overused. It has not been possible to do this since early 2017 or late 2016, around the time the nice java-script right click menu appeared (`Directions from here`; `Directions to here`; etc). The right click menu can be disabled by shift+right-clicking, but the `View Image` option is no longer available. Someone, Tom Hughes I think, developed an alternative to the standard java-script right click menu, that had an additional item, "View tile info" (or similar) and even had a demo working (on github, I think). It was a wonderful addition to the java-script right click menu. I'm wondering if anyone knows what's happened to it? Is it being considered for inclusion on the main site? Is that demo still running? If it's not an option, is there another way to mark tiles as dirty?