Use API calls to get the labels of all issues and pull requests from the notification list.
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The unauthenticated GitHub API is limited to 60 requests per hour, to increase this, you can provide a token to be used.
To get a personal access token go to https://github.com/settings/tokens/new and give the token a name.
To enable private repos, you will need to enable the repos scope for the token.
Open the developer console with F12 or Ctrl+Shift+J and run the following command, substituting YOUR_TOKEN_HERE with your token starting with ghp_.
localStorage.setItem("gh_token", "YOUR_TOKEN_HERE");
Labels are fetched again every 2 hours. To manually clear the cached labels, run the following in the developer console:
localStorage.setItem("labels", "{}");