To include {% data variables.product.prodname_copilot %}, or other extensions, in all of your codespaces, enable Settings Sync. For more information, see "Personalizing {% data variables.product.prodname_github_codespaces %} for your account." Additionally, to include {% data variables.product.prodname_copilot %} in a given project for all users, you can specify GitHub.copilot as an extension in your devcontainer.json file. For information about configuring a devcontainer.json file, see "Introduction to dev containers."