I have seen GeckoFX and mozilla activex control but they are outdated.
Latest stable xulrunner is 8 and beta is 9. It would be nice to use those instead of old 1.9 (for GeckoFX)
Are there any info and/or documentation on latest xulrunner in C#?
You can get geckofx for xulrunner 8.0 from here: https://bitbucket.org/geckofx/geckofx-8.0/