I uploaded a file rather than typing in the text directly because i am not familiar with phabricator, and the changes to purebrowser and installed extensions made it even more flakey in my hands, and after having my text twice wiped out, and rushing to catch a plane, it was easier to put a file on my computer. and upload it.
Also when you upload a file to emacs, no one knows it is uploaded as it is simply appended to the buffer, but phabricator chooses not to do that.

Obviously, title should be purebrowser bug and the line in mybrowser that reads "exec /usr/lib/purebrowser/purebrowser" should have $1 appended at the end of the line.

Dear @jonas.smedegaard ,
I joined this thread because I had two problems I thought were related to the subject matter. I apologize for not providing more information about version numbers, but not for going off-focus. I think you should pay attention, as you have, to what I report for two reasons; I have been solving (and causing) programming problems since likely before you were born, and I have solved the problems I initially told you about.

I installed three different versions of webext-ublock-origin. 1 from pureOS amber. 2 from github. 3) from gnu. In my hands, they all behaved the same as I described.

emmes would like to comment on his experience with purebrowser-68.02esr from the amber repository.
I was able to install webext-ublock-origin and it initially worked as it should. After an exit and relaunch, the icon was missing from the menu toolbar and the add-on did not work. It can be made to work by going to Add-ons, disabling it and then renabling it. A second problem with purebrowser, which may or may not be related, is that once Privacy badger is installed, it cannot be uninstalled or reported.