/usr/share/epiphany/epiphany.scr is in epiphany-data 0.7.0+0-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | # This file is used to find data dir.
# future versions of epiphany may use this file
# for resource configuration
|