Reproducible: always
Platform-specific: no
Regression: yes.
Reproducible since: 8u76b01.
Steps to reproduce:
1. Run application with WebViewBrowser via proxy (-DproxyPort=... -DproxyHost).
2. Login to Gmail.
3. Click by your profile icon and select "Logout"

Expected: user logged out.
Actual result: java crashes.

Failure is reproducible only under certain conditions (changed useragent), but crash could be a sign of more serious problem.