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 i686 | Operating System:  Linuxrunning on a Intel Pentium Pro CPU |
| es-AR | Language Tag, indicates the language for which the client had been localized (e.g. menus and buttons in the user interface) es-AR =  Spanish - Argentina |
| rv:1.9.1.8 | CVS Branch Tag The version of Gecko being used in the browser |
| Gecko | Gecko engine inside |
| 20100214 | Build Date: the date the browser was built |
| Ubuntu | Ubuntu Linux distribution |
| 9.10 | Version 9.10 |
| karmic | Codename: karmic |
| Firefox | Name : Firefox |
| 3.5.8 | Firefox version |
| First visit: | 2010.03.14 03:13 |
| Last visit: | 2025.09.28 03:11 |
All Firefox user agent strings | |