I do not work at Purism, but I suggest using the Forums for this and your other question. There are lots of really good folks there, and I know some Purism employees read the posts too. You might get more and faster responses. Tracker is really for bugs.

In any case, I think PureBrowser is no longer supported anyway. They are moving to Epiphany. Just from my reading of the link and posts, my guess is the Librem 5 had much to do with this.