User Agent String explained :
 Firefox 3.5.8 | |
|---|---|
| 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 |
| X11 | X Window System a windowing system for bitmap displays |
| U | Security values:
|
| Linux x86_64 | Operating System:  Linuxrunning on a Intel CPU running on a 64 bit processor |
| es-ES | Language Tag, indicates the language for which the client had been localized (e.g. menus and buttons in the user interface) es-ES =  Spanish - Spain |
| rv:1.9.1.8 | CVS Branch Tag The version of Gecko being used in the browser |
| Gecko | Gecko engine inside |
| 20100216 | Build Date: the date the browser was built |
| Fedora | Fedora Linux distribution |
| 3.5.8-1.fc11 | Package file version number : 3.5.8 Package revision number : 1.fc11 |
| Firefox | Name : Firefox |
| 3.5.8 | Firefox version |
| First visit: | 2010.03.19 01:46 |
| Last visit: | 2025.09.29 11:38 |
All Firefox user agent strings | |