User Agent String explained :
 Firefox 3.5.7 | |
|---|---|
| Mozilla | MozillaProductSlice. Claims to be a Mozilla based user agent, which is only true for Gecko browsers like Firefox and Netscape. For all other user agents it means 'Mozilla-compatible'. In modern browsers, this is only used for historical reasons. It has no real meaning anymore |
| 5.0 | Mozilla version |
| Windows | Platform |
| U | Security values:
|
| Windows NT 6.0 | Operating System:  Windows Vista |
| de | Language Tag, indicates the language for which the client had been localized (e.g. menus and buttons in the user interface) de =  German |
| rv:1.9.1.7 | CVS Branch Tag The version of Gecko being used in the browser |
| Gecko | Gecko engine inside |
| 20091221 | Build Date: the date the browser was built |
| Firefox | Name : Firefox |
| 3.5.7 | Firefox version |
| .NET CLR 1.1.4322 | .NET framework Version : 1.1.4322 |
| .NET CLR 2.0.50727 | .NET framework Version : 2.0.50727 |
| .NET CLR 3.0.30729 | .NET framework Version : 3.0.30729 |
| .NET CLR 3.5.30729 | .NET framework Version : 3.5.30729 |
| First visit: | 2010.01.30 02:53 |
| Last visit: | 2025.09.01 08:38 |
All Firefox user agent strings | |