By running source code locally rather than from a remote server, the extension offers a more secure environment for MEGA's zero-knowledge encryption to operate. Current Availability Status

If the extension is essential to your workflow, MEGA continues to offer fully supported, up-to-date extensions for Google Chrome and Microsoft Edge . meganz/web-extension: mega.nz browser extensions - GitHub

MEGA has officially ceased support for the Firefox extension due to the 4-week review delay imposed by Mozilla.

The extension stores MEGA’s source code (HTML, CSS, and JavaScript) locally on your machine. This eliminates the need to download and verify the site's code from the web every time you visit, leading to significantly faster page loads.