Is Pixiv Toolkit safe?

Low risk

Pixiv Toolkit overrides CORS headers on Pixiv and pximg domains, allowing any webpage to read image resources cross-origin.

The extension registers webRequest listeners on Pixiv-related domains and injects a forged Referer header to bypass hotlink protection on pximg.net. It also rewrites Access-Control-Allow-Origin response headers to '*', removing the original value. This means any webpage — not only pixiv.net or fanbox.cc — can issue cross-origin requests to i.pximg.net and read the response content in JavaScript.

Part of this rating comes from analysis signals we haven't published as detailed findings yet.

Leo Dingv4.9.0Firefox Add-ons
17Risk
Who publishes it

Leo Ding - no other listings under this identity, 5 shared hostnames

What this publisher told the store about itself, and the other listings that told it the same thing.

Shared hosts - 5 hostnames

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.

downloads.fanbox.cc
Also called by 3 other listings, including Pixiv Fanbox Downloader
fanbox.cc
Also called by 3 other listings, including PTK, Pixiv Fanbox Downloader
s.pximg.net
Also called by 3 other listings, including PTK
api.fanbox.cc
Also called by 4 other listings, including PTK, Pixiv Fanbox Downloader
kazupon.github.io
Also called by 5 other listings, including PTK, start.me, Bookmarker by start.me

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 4.9.0. Asking for a permission is not a finding on its own - it is what the extension can do if it chooses to.

  • Read and change your data on pixiv.net

    *://*.pixiv.net/*

  • Read and change your data on pximg.net

    *://*.pximg.net/*

  • Read and change your data on techorus-cdn.com

    *://*.techorus-cdn.com/*

  • Read and change your data on fanbox.cc

    *://*.fanbox.cc/*

  • Watch every request your browser makes

    webRequest

  • Watch, block and rewrite every request your browser makes

    webRequestBlocking

  • Store data in your browser

    storage

  • Store an unlimited amount of data in your browser

    unlimitedStorage

Updated 2 November 2026amo-2601410