Are they saying pureos is a fork of triquel or just the web browser is from abrowser?
"Purism uses a fork—creates a distinct & separate piece of software—of Firefox, developed by the Trisquel development team. Wikipedia characterizes Trisquel as a fully F/LOSS system without proprietary software or firmware, noting that it is “listed by the Free Software Foundation as a distribution that contains only Free software.” Purism takes this already exemplary version then optimize it for the Librem laptops running PureOS and adds more privacy protections."
https://puri.sm/posts/the-four-browser-freedoms/
Are they saying pureos is a fork of triquel or just the web browser is from abrowser?
Obviously the latter meaning. If we do some English grammar analysis on the sentence "Purism uses a fork—creates a distinct & separate piece of software—of Firefox, developed by the Trisquel development team." Simply remove everything between the dashes, and we get "Purism uses a fork of Firefox, ..."