Awesome browser extensions for GitHub 
All numbers are updated daily and include the overall usage of an extension across all browsers, the last publish date and stars of the GitHub repository!
Codeless contribution
Submitting a new extension is easy as opening an Issue. In fact, this is all you have to do. Create a new issue, that's it! I'll take it from there. If you need to update an existing listing, please follow the formal pull request process.
Want to know more about this process? Check out the Codeless Contributions with GitHub Issue Forms post on my blog.
List of browser extensions for GitHub
Advanced GitHub Notifier 
Shows notifications when you get a new notification on GitHub and provides quick access to all notifications in a popup.
Installs: 113 | Stars: 79 | Last update: 2 Jun 2023
Autoviewed 
Removes clutter from your pull request by automatically marking as viewed files that aren't worth reviewing.
Installs: 39 | Stars: 8 | Last update: n/a
CodeWing 
Next level code navigation for GitHub.
Installs: 599 | Stars: 65 | Last update: n/a
Codeflower

Visualize GitHub repos as d3 force-directed graphs. The extension gives you a quick overview of the size and composition of any repo.
Installs: 18 | Stars: 15 | Last update: 25 Apr 2022
CoderStats link for GitHub

The CoderStats link for GitHub Chrome extension displays a link to the CoderStats page for the currently displayed user or organization profile page on GitHub.
Installs: 13 | Stars: 20 | Last update: 2 May 2023
Contributors on GitHub

Show the # of PRs and other contributors stats in the Issues/PRs tab. Can be helpful for maintainers that want to know if it's a contributor's first PR.
Installs: 6 | Stars: 467 | Last update: 1 Mar 2021