WebExtension/background.js

let backgroundPage = browser.extension.getBackgroundPage();
//let tab;
const pass_data = {urls:"urls",tab:"tab_id"}

readUrl();
//on addon click load extension page
//
function Setup(data)
{
	let promise;
	 browser.browserAction.onClicked.addListener(() => {
				
				promise = browser.tabs.create({"url": "home.html"},function(tab){
						
						browser.runtime.onMessage.addListener(()=>{
								run(data,tab);
								console.log("pass tab data to run, in promise");
								console.log(tab);
						});
				});


		});

}

function failure(value)
{
		console.log("tabs.create returned a failure");
}

async function run(data,tab)
{		
		let i2=0;
	//	injectScript(tab);
		await		 browser.scripting.executeScript({
						target:{
								tabId: tab.id
						},
						files:["spawn.js"]
				});
		console.log("bbackground.js: received start signal...");
		if(i2 == 0)
		{
				browser.runtime.sendMessage({state: "Init",url: data.subscriptions[0].url});
		}
		else
		{
				browser.runtime.sendMessage({state: i2,url: data.subscriptions[i2].url});
		}
		i2++;
}

function readUrl()
{		
		let data;
		const filePath = "newpipe_subscriptions_202403101004.json";
		var localURL = browser.extension.getURL(filePath);
		fetch(localURL).then((res) => {
								if(!res.ok){
										throw new Error
											(`res error`);
								}
								return res.json();
						})
						.then((data) => {
								for(let i=0;i<i;i++) //i in data.subscriptions)
								{
										let open=null;
										console.log(data.subscriptions[i].url);
										try{
											open = alert(data.subscriptions[i].url,"_blank");
										}
										catch(e) {InsertError(e.description);}
								}
								console.log(data);
								Setup(data);
						})
						.catch((error)=> console.error("couldnt fetch data",error));


}