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I find myself wondering if it relies on the "for printing" reformating of various sites. This because i was browsing one site i could have sworn had the icon earlier using desktop Firefox, but it didn't show up. That is until i enable the JS of s third party printing framework in Noscript. After that it showed up.



It's using this code:

https://github.com/mozilla/readability/blob/master/Readabili...

which is a descendant of the original Readability.js published by Arc90, before they decided to turn it into a proprietary Instapaper clone.

It extracts what looks like article text from the page markup. DOM elements included for a printer-friendly view could possibly be helping, but it doesn't target that directly.




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