Un peu une saloperie ce HSTS tout de même
Chrome:
Open Chrome
Type chrome://net-internals/#hsts in the address bar of chrome
Query domain: if it appears as a result, it is HSTS enabled
Firefox:
Open file explorer
Copy paste %APPDATA%\Mozilla\Firefox\Profiles\ in the address bar of file explorer (for Linux it is ~/.mozilla/firefox)
Double click the folder you see (if you have multiple FF profiles, there will be multiple folders)
Open SiteSecurityServiceState.txt. This textfile contains sites that have enabled HSTS.
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http://security.stackexchange.com/questions/92954/how-can-i-see-which-sites-have-set-the-hsts-flag-in-my-browser