Just follow below trick…
When your search page comes just use paste block and store it into variable… and then check it that of it contains http or https then automatically paste it…
I Don’t think its possible with this extension. because we want to get value from third party apps like chrome or any. and also it should be automatically pasted.
just like torrent
Using clock timer just check if clipboard.paste not equal to last_detected then store clipboard.paste to last_detected and check if it contains google.com or not…
If it contains is true then paste it in your search textbox…