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Adds an emoji reaction button beside every star on dev-null.sh, with a searchable Unicode picker, skin tones, reaction counts, changes, and removals.
Each reaction is recorded as a Git commit in one JSON file per post. The extension reads the committed files directly from GitHub. No GitHub Pages.
Download and extract dev-null-reactions.zip, enable Developer mode in Chrome/Helium's extensions page, then choose Load unpacked and select the extracted folder. Reload dev-null.sh.
The default flow opens a prefilled GitHub issue for you to submit. Connect a GitHub token in extension settings for one-click reactions. Shared counts update after GitHub Actions processes the submission; GitHub caching can add delay.
Validated with 12 protocol/writer tests, 8 browser tests including the actual MV3 service worker, and a visual check on the live dev-null feed. No test reactions were submitted to real posts.