Move existing installations for Facebook from HTTP to HTTPS

verifyMozAppsInstallation.js

function verifyMozAppsInstallation() {
	if (!navigator.mozApps || window.locationbar.visible) {
		// Not running as Firefox app
		return;
	}
	// Prevent multiple checks per day
	// FIXME: Use a time-limited cookie
	if (localStorage.mozAppsChecked) {
		console.log('Skipped verifyMozAppsInstallation');
		return;
	}
	localStorage.mozAppsChecked = true;

	var showHint = function() {
		// FIXME: Make a better UX and wordsmith this
		var confirmed = window.prompt('A Facebook update is available. Do you want to install it now?');

		if (!confirmed) {
			return;
		}

		// Option A - Open Marketplace

		new MozActivity({
			name: 'marketplace-app',
			data: {
				slug: 'facebook-1'
			}
		});

		// xor Option B - Install from FB

		var request = navigator.mozApps.install('https://m.facebook.com/openwebapp/manifest.webapp');
		request.onsuccess = function() {
			if (!request.result) {
				return;
			}
			// FIXME: Tell user to delete the old icon
			request.result.launch();
		};
	};

	// Check if current origin is installed
	var request = navigator.mozApps.getSelf();
	request.onsuccess = function() {
		// Not installed
		if (!request.result) {
			showHint();
		}
	};
}