Web Compatibility Support • VR.fi shows error page

The page loads fine initially, but then shows the "Oops, something went wrong!" page. Palemoon 34.3.1 on Linux. I cannot reproduce the error with other browsers.

CODE:

DOMException [SyntaxError: "':not(:defined)' is not a valid selector"code: 12nsresult: 0x8053000clocation: https://www.vr.fi/_next/static/chunks/3onefwymwhen5.js:2] 3nh6nexff7_ps.js:51:3116Failed to clear old visitor cache database DOMException [SecurityError: "The operation is insecure."code: 18nsresult: 0x80530012location: https://service.giosg.com/bar/visitor.442e7e3f5ca40b919a0f.js:1]