We are between a rock and a hard place with PureBrowser and are sorry for the trouble it’s caused these last few weeks. Firefox 68 ESR has made it a lot harder to unMozilla (disable telemetry, remove Pocket integration, etc) the browser. There is also the upstream bug regarding unBlock Origin that stopped the extension from functioning.
Because of these issues, we’ve rolled back to 60 ESR and will continue on with this version while it is still supported upstream.
If people are looking for alternatives, GNOME Web is available in our repos. It can be found in Software or by opening Tilix and running apt install epiphany-browser.