Install MLE from the Firefox Add-Ons page
Download the last self-hosted version to install it manually: mle-webext.xpi (v2.11.0)
Future updates should then theoretically be automatically received from the Firefox store version.
Install MLE from the Chrome Web Store
Install MLE in Chrome
Install MLE in Chrome
Install – Drag&drop the mle.crx file on the chrome://extensions page. (Screenshot.)
If you use Chromium or Chrome (dev) or Chrome not on Windows, you can install it from here without using the Web Store.