tabs.goBack()

Navigate to the previous page in tab's history, if available.

This is an asynchronous function that returns a Promise.

var withGoingBack = browser.tabs.goBack(
  tabId,                  // optional integer
  callback                  // optional function
)

tabIdOptional

integer. The ID of the tab to navigate. Defaults to the active tab of the current window.

callbackOptional

function. When the page navigation finishes, this function is called without parameters.

A Promise that is fulfilled when the page navigation finishes.

Go back to the previous page in the current tab:

function onGoBack() {
  console.log("Gone back");
}

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

var goingBack = browser.tabs.goBack();
goingBack.then(onGoBack, onError);