When viewing a repository on the Github website, an Octocat icon will appear in the address bar - press CTL-SHIFT-f and a search box will appear. Check out the source here: https://github.com/afeld/github-find
You can Follow the below Step By Step procedure to install the github-find Chrome Extension to your Chrome Web browser.
It is the github-find Chrome extension download link you can download and install Chrome Browser.
Open GitHub repositories in online web IDE
Easily search GIPHY to add a GIF into any GitHub comment box.
Surf github / gitlab / bitbucket repository in vscode with github.surf
Zenhub – Project Management Inside GitHub
Enable code folding when viewing files in GitHub.
Explore npm dependencies on GitHub repos