pageAction.getPopup()

Gets the URL for the HTML document set as the popup for this page action.

This is an asynchronous function that returns a Promise.

details

object.

tabId

integer. ID of the tab whose popup you want to get.

A Promise that will be fulfilled with a string containing the popup's URL.

Add a context menu item that logs the popup URL for the current tab. Note that you'll need the contextMenus permission in your manifest to create context menu items.

function gotPopup(popupURL) {
  console.log(popupURL);
}

browser.contextMenus.create({
  id: "get-popup",
  title: "Get popup URL"
});

browser.contextMenus.onClicked.addListener(function(info, tab) {
  if (info.menuItemId == "get-popup") {
    let gettingPopup = browser.pageAction.getPopup({tabId: tab.id});
    gettingPopup.then(gotPopup);
  }
});