On GitHub a PR into production looks exactly like one into staging. The base branch is a small grey label, and I've approved the wrong one more than once.
PR Redline is a Chrome extension that colours PR pages by their base branch:
- Red for main/production by default, any colours for other branches (up to 8 groups)
- Marks matching PRs on the repo's PR list
- Sidebar lists the other open PRs into the same branches
- New in 1.6.0: an "Agent prompt" drawer that copies a claude/codex/opencode command to update all those branches and resolve conflicts (it never merges)
It runs only on github.com, needs no token or account, and collects no data. It reads the PR list with your existing GitHub session.
Feedback welcome
Top comments (2)
A colour cue is a good guard against the wrong click, since the base branch label is easy to miss. It pairs well with a hard stop on the GitHub side too: branch protection on production with required reviews, and a deployment environment that needs an approval before anything ships. Then a tired approve click on the wrong PR still cannot reach production on its own.
thanks for a comment, please test the extension if you may, let me know what you think