User Agent 字符串描述 :

FirefoxFirefox 21.0
MozillaMozillaProductSlice. 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
5.0Mozilla version
Windows NT 6.1Operating System:
icon Windows 7
WOW64(Windows-On-Windows 64-bit) A 32-bit application is running on a 64-bit processor
rv:21.0 CVS Branch Tag
The version of Gecko being used in the browser
Gecko Gecko engine inside
20130330 Build Date:
the date the browser was built
FirefoxName :
Firefox
21.0Firefox version
 
First visit: 2013.03.31 01:55
Last visit:2015.10.26 09:56

All Firefox user agent strings