I'm not sure where you can get the current code for Safari's Reader Mode but interestingly, it was based on the original Readability.js code, created and open s

I'm not sure where you can get the current code for Safari's Reader Mode but interestingly, it was based on the original Readability.js code, created and open sourced by a development shop called Arc90 [0]. As you noted, Firefox was also based on Readability (in the repo you linked to, you can see that it's copyright 2010 by Arc90). By this point both browser implementations may largely have been rewritten. Arc90 was acquired (oddly, by a short-lived EDM festival promoter called SFX), and its founder later started another agency called Postlight which created a similar extension for Chrome called Mercury Reader [1]. [0] https://jaxenter.com/safari-5-reader-based-on-open-source-readability-code-101504.html https://jaxenter.com/safari-5-reader-based-on-open-source-re... [1] https://postlight.com/insights/the-postlight-mercury-platform-just-added-its-millionth-user https://postlight.com/insights/the-postlight-mercury-platfor...