The end of XULRunner
Avishkar Autar · Nov 10 2015 · Web Technologies
I’ve written a bit on XULRunner (and the related technologies, XUL and XPCOM) for application development, so I felt it was apt to mention that Mozilla no longer provides new builds of XULRunner. The recommended way to run XULRunner-based application is via the Firefox executable (Firefox ships with a private private XULRunner package):
firefox -app application.ini
You can take a copy of a Firefox installation and or compile Firefox from source, which is surprisingly easy.
One nice side effect worth mentioning: while I could never get proper high-DPI support with XULRunner, it works perfectly when Firefox is used as the runner.