Is Weblio エクステンション safe?

Medium risk

Weblio エクステンション sends selected page text to api.weblio.jp in an embedded quote iframe.

When you select text on an HTTP or HTTPS page, the extension builds a Weblio quote URL and inserts it as an iframe. On HTTP pages, that iframe can load over HTTP, sending the selected text to api.weblio.jp without transport encryption.

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

GRASグループ株式会社v3.0Chrome Web Store
43Risk
Who publishes it

ウェブリオ株式会社 - 1 other listing from the same operator, none carrying a finding

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

Publisher
GRASグループ株式会社
Declared legal entity
ウェブリオ株式会社

Same store account

1 other listing published from this account, 100k+ users between them, none of them carrying a finding.

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 3.0. 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 every site you visit

    http://*/*

  • Read and change your data on every secure site you visit

    https://*/*

  • Add items to the right-click menu

    contextMenus

  • Run hidden pages in the background

    offscreen

  • Store data in your browser

    storage

  • See the address and title of every tab you have open

    tabs

Where it sends data

Destinations our analysis observed Weblio エクステンション 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.

  • api.weblio.jp

    Weblio エクステンション sends data to api.weblio.jp. One other extension we have analysed sends data here.

Updated 30 September 2026pgnfefoljgaelbckgfbijijhblgophjo