Trying to send key sequences to a browser

[M0YGH]

I thought I'd had it sussed. almost working. I am writing an overlay (using tkinter) to fit over a full screen 'kiosk' mode browser. Similar problems with chrome & Firefox. I want to send Zoom in & out to flightradar24 via tkinter buttons. I set up an akh (version 2) object called win in the __init__of my class. and did a win.activate which brings the window up. I tried this code on an IrfanView image and the zoom buttons work fine. No such luck with the chrome and firebox browsers. Buttons do nothing. Almost had it working by creating a new object every time button pressed, BUT eventually the python program hangs on a win.activate. If I do a win.activate before sending the keys then then program hangs. code attached, also simple one that just sends zoom requests that works, but then again focus isn't removed from the browser/irfan windows.
FlightRadarOverlay.py

test_ahk_notepad2.py

[M0YGH]

Ok, its working in Firefox. Interestingly I am sending keys from the numpad, the + and - (zoom) worked, the up, down, home & end didn't until i did a click into the window after activating the Window.