tabs.show()

Shows one or more tabs that were previously hidden by a call to tabs.hide.

This is an asynchronous function that returns a Promise.

var showing = browser.tabs.show(
  tabIds          // integer or integer array
)

tabIds

integer or array of integer. The IDs of the tab or tabs to show.

A Promise that will be fulfilled with no arguments. If any error occurs, the promise will be rejected with an error message.

Show a single tab:

function onShown() {
  console.log(`Shown`);
}

function onError(error) {
  console.log(`Error: ${error}`);
}

browser.tabs.show(2).then(onShown, onError);

Show multiple tabs:

function onShown() {
  console.log(`Shown`);
}

function onError(error) {
  console.log(`Error: ${error}`);
}

browser.tabs.show([15, 14, 1]).then(onShown, onError);