Note also that the script given above may give very weird results when the active window is switched by a popup or another program just when you press ctrl+t, this version ensures that when that happens the script won't send the other ctrl+l unexpectedly much later by adding a one-second max time between the ctrl+t and ctrl+l.
; Have the address bar open when you press ctrl+t by adding a ctrl+l right after it.
; Workaround for bug described here: https://forum.vivaldi.net/topic/30740/
#IfWinActive, ahk_exe vivaldi.exe
^t::
Send, ^t
WinWait , Start Page - Vivaldi,, 1
Send, ^l
return
#IfWinActive
Compile this with AutoHotkey, and move either the executable or a shortcut to it to this location to have it startup when you boot your computer:
C:\ProgramData\Microsoft\Windows\Start Menu\Programs\StartUp