Manually trigger the update of Firefox extensions

update-ff-extension.js

'use strict'; /* globals AddonManager, */

/**
 * Triggers the update of an extension in Firefox (version 60).
 * Paste the function in the Browser console (Ctrl+Shift+J),
 * call it with an extension ID and watch the console output.
 *
 * I wrote this to test the automatic build and update of my
 * extensions `-dev` channel, see:
 *  - https://gist.github.com/NiklasGollenstede/87664c7f2822b15f86362388270a16a8
 *  - https://gist.github.com/NiklasGollenstede/60aa2dc957f985eff2b7a2655ea1092b
 *
 * This is pieced together from noLegacyStartupCheck > checkOne in
 * resource://gre/modules/addons/XPIProvider.jsm of Firefox 60.
 * It looks like this should still work in Firefox 70.
 * It might not be wise to use this with a production profile.
 *
 * @param  {string}  id  The "Extension ID" on `about:debugging#addons`.
 */
async function updateNow(id) {
	const addon = (await AddonManager.getAddonByID(id));
	const update = (await new Promise(resolve => addon.findUpdates({
		onUpdateFinished() { resolve(null); },
		onUpdateAvailable(addon, update) { resolve(update); },
	}, AddonManager.UPDATE_WHEN_NEW_APP_INSTALLED)));  // use UPDATE_WHEN_USER_REQUESTED instead?
	if (!update) { console.log('no update available'); return; }
	console.log('installing ...');
	try { (await new Promise((good, bad) => { update.addListener({
		onDownloadFailed: bad, onInstallFailed: bad, onInstallEnded: good,
	}); update.install(); })); }
	catch (error) { console.error('installation failed', error); return; }
	console.log('installation done');
}

void updateNow;