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HomeAwesome NicoNico Downloader
Findings · 3
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MEDIUM FINDINGS · 3
  1. 01Popup and in-extension error handler transmit a persistent per-install UUID, extension ID, version, browser language, and any caught JavaScript error string to the vendor domain pbion.com/report/
  2. 02declarativeNetRequest rules and MV2 webRequest fallback rewrite Origin and Referer headers on requests to Niconico CDNs to www.nicovideo.jp and add Access-Control-Allow-Origin: * on responses, bypassing Niconico CORS and origin checks so the extension can read protected video, manga, and illustration assets
  3. 03On download, the extension opens a new tab to pbion.com/<lang>/niconico-downloader.html with a URL fragment data= containing the Niconico video id, group, user and selected quality, so pbion.com receives which videos users download and when
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OTHER EXTENSIONS

Is Awesome NicoNico Downloader safe?

Clean risk

No summary available.

https://pbion.comv5.0.1Chrome Web Store
0Risk

AI-generated. Findings may contain errors. Those marked Verified have been manually reviewed.

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Findings

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Updated 30 May 2026jefkdjjbbmlokldmpehimfdefdcklagj

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