A userscript that adds a link to update your fork

• The userscript adds an "Update fork" link to the top of forked repo file list (see screenshot).

• Clicking on the update fork link takes you to a page that allows you to compare changes & create a pull request:

  https://github.com/{user}/{repo}/compare/{branch}...{owner-repo}:{branch}

Update fork link (in blue)

Target page (example)

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