User Agent String explained :
 Firefox 4.0 | |
|---|---|
| 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 |
| pl-PL | Language Tag, indicates the language for which the client had been localized (e.g. menus and buttons in the user interface) pl-PL =  Polish |
| rv:2.0 | CVS Branch Tag The version of Gecko being used in the browser |
| Gecko | Gecko engine inside |
| 20110307 | Build Date: the date the browser was built |
| Firefox | Name : Firefox |
| 4.0 | Firefox version |
| First visit: | 2011.04.26 02:24 |
| Last visit: | 2025.04.29 02:39 |
All Firefox user agent strings | |