The extension is a straightforward grid ruler tool that injects a UI overlay on the active tab when the user clicks its browser action. It uses only the 'activeTab' permission, which is appropriate for its functionality. No network requests, remote code loading, data collection, or other suspicious behavior was found in the source code. The ML risk score (0.00) and third-party risk score both indicate low risk. The manual review confirms that the code is benign. The only discrepancy is a mismatch between the bundled manifest (Manifest V2, only 'activeTab') and the published CWS listing (Manifest V3 with 'scripting' permission). This may be due to a store update not reflected in the provided ZIP, but the code we analyzed does not exhibit any malicious intent.