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Space marks the next unviewed file on a PR and scrolls to the following one. Spacebar Review for GitHub adds one shortcut to speed up pull request reviews. On a PR's "Files changed" tab, press Space to mark the next file as viewed and scroll to the one after it. When every file is viewed, the same Space press opens the "Submit review" menu. Runs only on github.com. Ignores Space when you're typing in comments or inputs. Collects no data.
rating_count is the Chrome Web Store ratings count, not a written-review count.