User Agent String explained :
 Firefox 3.1b3 | |
|---|---|
| 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 |
| Macintosh | Platform |
| U | Security values:
|
| Intel Mac OS X 10.5 | Operating System: OS X Version 10.5 : Leopard running on a Intel CPU |
| fr | Language Tag, indicates the language for which the client had been localized (e.g. menus and buttons in the user interface) fr =  French |
| rv:1.9.1b3 | CVS Branch Tag The version of Gecko being used in the browser |
| Gecko | Gecko engine inside |
| 20090305 | Build Date: the date the browser was built |
| Firefox | Name : Firefox |
| 3.1b3 | Firefox version |
| First visit: | 2009.03.29 10:53 |
| Last visit: | 2018.07.29 08:32 |
All Firefox user agent strings | |