Solution : https://service.sap.com/sap/support/notes/960549 (SAP Service marketplace login required)
Key words :
extra empty browser window displayed, leaved/terminated statefull applications, session release agent feature, previously displayed portal applications, terms portal display firefox, firefox/mozilla breaks sending, enterprise portal throuhg firefox, internet explorer version 6, support adding entries, tools->options->tab
Related Notes :
| 1458799 | Limited supportability for Internet Explorer 8 & 9 |
| 1029680 | BEx Web applications Java: Limiations for Firefox |
| 990034 | Firefox browser for end users |
| 957075 | FireFox Limitations for Theme Editor |