Is nico downloader safe?
nico downloader mirrors its settings and NicoNico dictionary resume markers into page-origin localStorage.
The extension runs on www.nicovideo.jp and dic.nicovideo.jp to download videos and enhance NicoNico pages. Its shared options helper writes extension settings, and dictionary page resume markers, into the page's localStorage as well as chrome.storage.local, making those values available to scripts running on the same NicoNico origin.
Part of this rating comes from analysis signals we haven't published as detailed findings yet.
Who publishes it__＿＿__ - no other listings under this identity, 1 shared hostname
__＿＿__ - no other listings under this identity, 1 shared hostname
What this publisher told the store about itself, and the other listings that told it the same thing.
Shared hosts - 1 hostname
Hostnames hardcoded in this extension that few other listings call. That can mean one operator behind both, and it can equally mean a small shared vendor, so it is context rather than a conclusion. Hosts that many listings call are left out: they are services, not connections.
AI-generated. Findings may contain errors. Those marked Verified have been manually reviewed.
Publishers can request a review.
What it can do
Permissions this extension asks for, as declared in version 5.0.0.20. Asking for a permission is not a finding on its own - it is what the extension can do if it chooses to. The current listed version is 5.0.0.22, which we have not unpacked yet.
Store data in your browser
storage
Where it sends data
Destinations our analysis observed Nico Downloader contacting. Sending data somewhere is not a finding on its own - an extension that syncs your settings has to talk to its own server - but it is where your data can go, and who else it goes to.
- www.nicovideo.jp
Nico Downloader sends data to www.nicovideo.jp. One other extension we have analyzed sends data here.
- dic.nicovideo.jp
Nico Downloader sends data to dic.nicovideo.jp. No other extension we have analyzed sends data here.