Is X-notifier (for Gmail,Hotmail,Yahoo,AOL ...) safe?

Medium risk

X-notifier uses plain HTTP for some optional forum and mail checker requests, including credentials or mailbox data.

Some X-notifier account checkers contact their services over unencrypted HTTP after the user enables and configures them. The forum checker sends configured login credentials to xnotifier.tobwithu.com, while Nate and Yahoo Japan mail checks retrieve mailbox state over HTTP where cookies, headers, and mailbox metadata may travel without transport encryption.

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

Byungwook Kangv4.2.23Firefox Add-ons
45Risk
Who publishes it

Byungwook Kang - no other listings under this identity, 16 shared hostnames

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

Publisher
Byungwook Kang
Website
xnotifier.tobwithu.com/

Shared hosts - 16 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.

home.mail.nate.com
Also called by 1 other listing: X-notifier
login.daum.net
Also called by 1 other listing: X-notifier
mail.aol.de
Also called by 1 other listing: X-notifier
mail.aol.fr
Also called by 1 other listing
mail.aol.jp
Also called by 1 other listing
mail3.nate.com
Also called by 1 other listing
tobwithu96.cafe24.com
Also called by 1 other listing
track.tiara.daum.net
Also called by 1 other listing
xo.nate.com
Also called by 1 other listing: X-notifier
login.aol.com
Also called by 2 other listings, including Swash
logins.daum.net
Also called by 2 other listings
static.nid.naver.com
Also called by 2 other listings
cmail.daum.net
Also called by 3 other listings, including X-notifier Neo
xnotifier.tobwithu.com
Also called by 3 other listings, including X-notifier Neo
mail.daum.net
Also called by 5 other listings, including X-notifier Neo
nate.com
Also called by 6 other listings

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 4.2.23. 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://*/ and 1 more

  • Read and change your data on mail.google.com

    https://mail.google.com/

  • Read and change your data on mail.yahoo.com

    https://mail.yahoo.com/

  • Read and change your data on login.yahoo.com

    https://login.yahoo.com/

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

    tabs

  • Show you desktop notifications

    notifications

  • Read and change cookies, including the ones that keep you signed in

    cookies

  • Store data in your browser

    storage

  • Watch every request your browser makes

    webRequest

  • Watch, block and rewrite every request your browser makes

    webRequestBlocking

  • Add items to the right-click menu

    contextMenus

Where it sends data

Destinations our analysis observed X-notifier (for Gmail,Hotmail,Yahoo,AOL ...) 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.

  • mail.yahoo.co.jp

    X-notifier (for Gmail,Hotmail,Yahoo,AOL ...) sends data to mail.yahoo.co.jp. No other extension we have analysed sends data here.

  • mail3.nate.com

    X-notifier (for Gmail,Hotmail,Yahoo,AOL ...) sends data to mail3.nate.com. No other extension we have analysed sends data here.

  • xnotifier.tobwithu.com

    X-notifier (for Gmail,Hotmail,Yahoo,AOL ...) sends data to xnotifier.tobwithu.com. No other extension we have analysed sends data here.

Updated 30 September 2026amo-4490