Mailspring/app/internal_packages/message-view-on-github/README.md

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View on GitHub

The "View on GitHub" plugin adds a button to the toolbar above the message view. When you view a message from GitHub that contains a "View on GitHub" link, the button appears and makes it easy to jump to the issue / pull request / comment on GitHub.

This example is a good starting point for plugins that want to create custom actions.