User Agent String explained :
 Firefox 3.5.9 | |
|---|---|
| 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 5.1 | Operating System:  Windows XP |
| zh-CN | Language Tag, indicates the language for which the client had been localized (e.g. menus and buttons in the user interface) zh-CN =  Chinese - China |
| rv:1.9.1.9 | CVS Branch Tag The version of Gecko being used in the browser |
| Gecko | Gecko engine inside |
| 20100315 | Build Date: the date the browser was built |
| Firefox | Name : Firefox |
| 3.5.9 | Firefox version |
| .NET CLR 3.5.30729 | .NET framework Version : 3.5.30729 |
| .NET4.0E | .NET framework Version : 4.0 Extended |
| First visit: | 2010.05.20 10:25 |
| Last visit: | 2018.07.29 02:37 |
All Firefox user agent strings | |