What our analysis found

Adding Furigana Function - Sateraito Office, used by 1,000,000 people, showed no malicious code in Extension Auditor's review. Our code review reported 1 finding (1 high), led by other. It comes from a trusted publisher and was last updated in February 2023.

Key findings

• high· other —The bundled manifest uses manifest_version 2, while the published Chrome Web Store listing reports manifest_version 3. This structural mismatch may indicate that the store listing has been automatically migrated or is inaccurate, but it does not reflect the actual permitted capabilities of the installed extension.

The extension is a legitimate Japanese language tool that adds furigana (ruby) to kanji. It processes text entirely locally using bundled dictionaries; there are no external network requests, tracking, or data collection. The required broad permissions are necessary for its content-modifying functionality. The only anomaly is a manifest version mismatch (MV2 in bundle vs. MV3 in published listing), which does not indicate malicious intent.