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Re:Ask HN: Which abandoned proprietary software would you re... by zmix on Saturday December 08, 2018 @02:02PM (#18636863)
> Documentation was poor or non-existent

That's absolutley not true.

"Rapid Application Development with Mozilla" has been published before 2004. It is still online: http://mb.eschew.org/

XUL (and assorted technologies) is/were broadly documentet on MDN.

Re:Ask HN: Which abandoned proprietary software would you re... by Rondom on Sunday December 09, 2018 @10:32PM (#18644976)
Not to mention xulplanet.com which had been very helpful as well.