[myfonj]

Sidenote: It is pretty much exactly the Googles (alas, auto-updated) "Go Back With Backspace" [0] does: [1] (you forgot the shift backspace, Google as well in past versions).

[0] https://chrome.google.com/webstore/detail/go-back-with-backs...

[1] https://crx.dam.io/source/crxviewer.html?crx=https://crx.dam... (nice to walk trough history of this file though versions https://crx.dam.io/ext/eekailopagacbcdloonjhbiecobagjci.html )