"Libxul.so is not found, in /usr/bin/libxul.so..........."

"JavaScript error: jar: file: ///usr/lib/xulrunner-qt5-38.8.0/omni.ja !/components/nsPrompter.js, line 370"

Possible corruption of xulrunner..?

In terminal, do 'pkcon search name xulrunner' - xulrunner-qt5-38.8 should be installed on your device, if not, install it.....alternatively, if it is installed, reinstall it, restart device and try opening sailfish browser again but with launcher icon not with terminal.