diff -up gimp-2.10.0/etc/gimprc.in.external-help-browser gimp-2.10.0/etc/gimprc.in
--- gimp-2.10.0/etc/gimprc.in.external-help-browser	2018-04-28 17:25:02.483242200 +0200
+++ gimp-2.10.0/etc/gimprc.in	2018-04-28 17:25:28.048193595 +0200
@@ -753,6 +753,7 @@
 # web-browser.
 # 
 # (help-browser gimp)
+(help-browser web-browser)
 
 # When enabled, a search of actions will also return inactive actions. 
 # Possible values are yes and no.