User Agent String.Com 

User Agent String explained :

Mozilla 1.7.12
Mozilla	Name : Mozilla
5.0	Mozilla version
X11	X Window System a windowing system for bitmap displays
U	Security values: N for no security U for strong security I for weak security
Linux i686	Operating System: Linux running on a Intel Pentium Pro CPU
x86_64	Using a 64 bit processor
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:1.7.12	CVS Branch Tag The version of Gecko being used in the browser For the Mozilla browser this is the browser version as well
Gecko	Gecko engine inside
20051010	Build Date: the date the browser was built
Debian	Debian Linux distribution
1.7.12-0ubuntu2	Package file version number : 1.7.12 Package revision number : 0ubuntu2
Last visit:	2021.05.07 10:06
All Mozilla user agent strings