WebExtension/home.js

const fileField = document.querySelector('input[type="file"]');

fileField.addEventListener("change",() =>
		{
				console.log(fileField.files[0]);
				browser.runtime.sendMessage({status:"FileChange",file: fileField.files[0]});
		});

document.getElementById("id_run").addEventListener("click", function(e){
		alert("Run script");
		startBackgroundScript();
		e.preventDefault();
});

function startBackgroundScript()
{
		browser.runtime.sendMessage("Button_clicked");
		console.log("home.js sent button_clicked message...");
}