Bandwidth-Monitor от Lorenox

This extension allows you to monitor your network bandwidth by measuring your download and upload speeds.

Features:
Light/Dark mode
Download/Upload speed font size changer
Number of parallel connections (1-8) (lower this setting if you have lower download speeds for more accurate measurements
Downloader interval changer (allows you to set how often the extension will measure download - reccomended to set heigher ammount of secconds if you have lower download speeds