Users are advised against using older, unmaintained versions of the extension (such as version 4.2.1 from 2021) that may still be found on third-party sites, as these have not been reviewed for years and may not function with current MEGA updates.
To protect your data, always ensure you are downloading the legitimate add-on created by MEGA Limited. Follow these step-by-step instructions to install it safely: mega nz extension firefox
For casual users downloading small text documents or images, accessing MEGA through a standard web page is perfectly fine. However, if you regularly handle large archives, media files, or rely on MEGA for secure backups, the Firefox extension is a crucial upgrade. It optimizes your hardware utilization, stabilizes massive transfers, and provides an essential layer of local cryptographic protection. Users are advised against using older, unmaintained versions