This script lets you navigate IE tabs with a tap of the control key. Double-tap goes the other way. You can change the hotkey of course. Ctrl just seems like the handiest for me.

#IfWinActive ahk_class IEFrame
Ctrl:: ; Lazy Tab (ctrl) for IE
if winc_presses > 0
{
winc_presses += 1
return
}
winc_presses = 1
SetTimer, KeyWinC, 300
return
KeyWinC:
SetTimer, KeyWinC, off
if winc_presses = 1
{
Send ^{TAB}
}
else if winc_presses = 2
{
Send ^+{TAB}
}
else if winc_presses > 2
{
}
winc_presses = 0
return