1. Login to JasperReports Server with an account not used by Visualize.js
2. Open a new tab on the web browser
3. Open a page using Visualize.js in a new tab
4. Switch back to the page showing JasperReports Server and do a page refresh
The logged in user changes to the one used by Visualize.js
I haven't tested this, but if I have several Visualize.js using different accounts, do Visualize.js work?