GKT v0.3.5 in greaseMonkey has this error in developer console:
Script error: TypeError: "Document.evaluate requires at least 2 arguments, but only 1 were passed"
init user-script:http://simor.net/greasemonkey//GeoKrety Toolbox:742
userScript user-script:http://simor.net/greasemonkey//GeoKrety Toolbox:792
scopeWrapper user-script:http://simor.net/greasemonkey//GeoKrety Toolbox:813
user-script:http://simor.net/greasemonkey//GeoKrety Toolbox:494
Raised in geokrety/geokrety-website#263