The plugin augments links to Github repositories. It appends a little box which shows the number of days since the last commit to that repository. It's only active on github.com.

Github Activity Indicator - Firefox Add-on
Github Activity Indicator is a Firefox add-on that adds a little indicator to Github repository links, showing the number of days since the last commit. Stay up-to-date with repository activity before following links.
Add-on stats
Manifest V2
Firefox on Android: No
Permissions:
- https://api.github.com/*
- storage
Size: 11.72K
Full description: See detailed description
Ranking
Other platforms
Not available on Chrome
Not available on Android
Not available on Edge
Add-on safety
Risk impact
Github Activity Indicator requires a few sensitive permissions. Exercise caution before installing.
Risk impact analysis details
- Critical Request access to the following domains: github.com
- High ******* ******* **** *** ****** ***** *** ***** ** ******* **** ********* ********* ** * *********** *****
Risk likelihood
Github Activity Indicator has earned a fairly good reputation and likely can be trusted.
Risk likelihood analysis details
- High This extension has low user count. Unpopular extensions may not be stable or safe.
- Low **** ********* *** ******* **** **** * ****** **** ***** ******** *** **** ****** ** ** ****** *** *****
- Low **** ********* *** ***** **** **** * ****** **** ***** ********** *** **** ****** ** ** ****** *** *****
- Good **** ********* *** **** **** *******
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