Purebrowser in amber on 19 Sep 2019, purebrowser/amber,now
68.1.0esr+really60.9.0esr-1~deb10u1pureos1 amd64, is on my system nearly
unusuable because it never exits.

     The window closes, but the instance persists, as evidenced by "ps -e | grep
pure".
     
     The problem seems to be that SQlite3.jsm does not want to exit.

A workaround is to use mybroswer which has the following code:

#!/bin/bash
while true; do
psinfo=`ps -e | grep purebrowser`
echo "psinfo = $psinfo"
info=`echo $psinfo | awk '{print $1;}'`
echo "info = $info"
if [[ $info == ""  ]]; then
break;
fi
kill -9 $info
sleep 1
done
exec /usr/lib/purebrowser/purebrowser

along with the following simple desktop file:

[Desktop Entry]
Encoding=UTF-8
Version=1.0
Type=Application
Exec=/u/local//bin/mybrowser %u
Terminal=false
Name=MyBrowser
Comment=Custom definition for PureBrowser
Icon=purebrowser
Categories=Network;WebBrowser;
MimeType=text/html;text/xml;application/xhtml+xml;application/xml;application/vnd.mozilla.xul+xml;application/rss+xml;application/rdf+xml;image/gif;image/jpeg;image/png;x-scheme-handler/http;x-scheme-handler/https;
StartupWMClass=PureBrowser
StartupNotify=true

     In the desktop file, you will want to replace /u/local/bin/mybrowser with
the full path to wherever within your PATH you place mybrowser. Clearly,
"mybrowser" could be "yourbrowser" or whatever other name you choose.

     One last fact, which I am not sure is revelant: Sometime after I discovered
the problem and before I found the workaround, I prevented PureOS from
installing a .mozilla folder in my home directory, by issuing "rm -rf
~/.mozilla; cat /dev/null > ~/.mozilla;".  I have a .purism/purebrowser
directory which serves the same purpose of storing profiles.