Scre.io is available as a web-application for Chrome, Edge and Firefox. It is available as an extension in the:

Chrome Web Store
Microsoft Edge Add-ons

Install the browser extension

Go to the Chrome Web Store or Edge Add-ons and click "Add to Chrome" or "Get".
Open Screen Recorder - Scre.io from the extension menu in your browser.
Start recording.

Updated on: 09 / 03 / 2021