Getting the URL of the current tab from a browser

$ xwininfo -id 0x800003

xwininfo: Window id: 0x800003 "x11 firefox tab at DuckDuckGo - Mozilla Firefox"

  Absolute upper-left X:  1605
  Absolute upper-left Y:  1
  Relative upper-left X:  0
  Relative upper-left Y:  0
  Width: 1978
  Height: 1078
  Depth: 24
  Visual: 0x569
  Visual Class: TrueColor
  Border width: 0
  Class: InputOutput
  Colormap: 0x800002 (not installed)
  Bit Gravity State: NorthWestGravity
  Window Gravity State: NorthWestGravity
  Backing Store State: NotUseful
  Save Under State: no
  Map State: IsViewable
  Override Redirect State: no
  Corners:  +1605+1  -1025+1  -1025-201  +1605-201
  -geometry 1978x1078+1604+0

(...)




           ░░                 
          ░░░ ░   ░░          
          ░░░░░░░▒▒▒▒░        
         ░░░░░░░░░▒▒▒░░       
         ░░░░░░░░░░▒▒░        
         ░░░░░░    ▒▒▒░       
         ░░░░░░░░░▒▒▒▒▒  ░░   
         ▒░░░░░▒▒▒▒▒▒▒▒  ░░   
         ▒▒░░░░▒▒▒▒▒▒▒▒░░░░ ░ 
         ▒▒▒▒░░▒▒▒▒▒▒▒▒░░░░░░ 
         ░▒▒▒▒░░▒▒▒▒▒▒░░░░░░░ 
          ▒▒▒▒▒▒░▒▒▒▒░░░░░░░  
          ░▒▒▒▒▒▒▒▒░░░░░░░░░  
           ▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒░   
            ▒▒▒▒▒▒▒▒▒▒▒▒▒▒    
             ░▒▒▒▒▒▒▒▒▒▒░     
               ░▒▒▒▒▒▒░       


(...)

_NET_WM_OPAQUE_REGION(CARDINAL) = 
_NET_WM_WINDOW_TYPE(ATOM) = _NET_WM_WINDOW_TYPE_NORMAL
_NET_WM_SYNC_REQUEST_COUNTER(CARDINAL) = 8388613, 8388614
_NET_WM_USER_TIME_WINDOW(WINDOW): window id # 0x800004
WM_CLIENT_LEADER(WINDOW): window id # 0x800001
_NET_WM_PID(CARDINAL) = 1525016
WM_LOCALE_NAME(STRING) = "en_US.UTF-8"
WM_CLIENT_MACHINE(STRING) = "svar"
WM_NORMAL_HINTS(WM_SIZE_HINTS):
                program specified minimum size: 300 by 95
                program specified maximum size: 32766 by 32766
                program specified base size: 300 by 95
                window gravity: NorthWest
WM_PROTOCOLS(ATOM): protocols  WM_DELETE_WINDOW, WM_TAKE_FOCUS, _NET_WM_PING,
_NET_WM_SYNC_REQUEST
WM_CLASS(STRING) = "Navigator", "firefox"
WM_ICON_NAME(STRING) = "How to get active google chrome url in the terminal? :
 commandline - Mozilla Firefox"
_NET_WM_ICON_NAME(UTF8_STRING) = "How to get active google chrome url in the
 terminal? : commandline - Mozilla Firefox"
WM_NAME(STRING) = "How to get active google chrome url in the terminal? :
 commandline - Mozilla Firefox"
_NET_WM_NAME(UTF8_STRING) = "How to get active google chrome url in the
 terminal? : commandline - Mozilla Firefox"

$ xprop
_NET_WM_STATE(ATOM) = 
_NET_FRAME_EXTENTS(CARDINAL) = 0, 0, 0, 0
_NET_WM_DESKTOP(CARDINAL) = 0
WM_STATE(WM_STATE):
                window state: Normal
                icon window: <field not available>
_NET_WM_ALLOWED_ACTIONS(ATOM) = _NET_WM_ACTION_CHANGE_DESKTOP,
 _NET_WM_ACTION_FULLSCREEN, _NET_WM_ACTION_CLOSE
WM_HINTS(WM_HINTS):
                Client accepts input or input focus: True
                Initial state is Normal State.
                window id # of group leader: 0x4200001
_SURF_URI(STRING) = "http://duckduckgo.com/"
_SURF_FIND(STRING) = ""
_GTK_THEME_VARIANT(UTF8_STRING) = 
XdndAware(ATOM) = BITMAP
_NET_WM_OPAQUE_REGION(CARDINAL) = 0, 0, 1978, 1078
WM_WINDOW_ROLE(STRING) = "Surf[6]"
_NET_WM_WINDOW_TYPE(ATOM) = _NET_WM_WINDOW_TYPE_NORMAL
_NET_WM_SYNC_REQUEST_COUNTER(CARDINAL) = 69206021, 69206022
_NET_WM_USER_TIME_WINDOW(WINDOW): window id # 0x4200004
WM_CLIENT_LEADER(WINDOW): window id # 0x4200001
_NET_WM_PID(CARDINAL) = 1637209
WM_LOCALE_NAME(STRING) = "en_US.UTF-8"
WM_CLIENT_MACHINE(STRING) = "svar"
WM_NORMAL_HINTS(WM_SIZE_HINTS):
                program specified minimum size: 0 by 0
                program specified base size: 0 by 0
                window gravity: NorthWest
WM_PROTOCOLS(ATOM): protocols  WM_DELETE_WINDOW, WM_TAKE_FOCUS,
 _NET_WM_PING,
_NET_WM_SYNC_REQUEST
WM_CLASS(STRING) = "surf", "Surf"
WM_ICON_NAME(STRING) = "[0%] @cgDISVMf:T | "
_NET_WM_ICON_NAME(UTF8_STRING) = "[0%] @cgDISVMf:T | "
WM_NAME(STRING) = "[0%] @cgDISVMf:T | "
_NET_WM_NAME(UTF8_STRING) = "[0%] @cgDISVMf:T | "