Uptime is a measure of the time a machine has been up without any downtime. As you understand, Linux operating systems have always been the masters of big uptime values and some of their users have always been measuring and sharing these values with others as a form of OS “power” and stability display.
Uptime Indicator extension simply adds an indicator on the top panel that measures and displays the Uptime.
My petty 29 minutes shown in the above screenshot…If you go further the fuzziness will increase, so you’ll see something like that:
To install this extension in your system, simply turn the switch to “ON”