This addon will check if domain of opened url, is registered within last 12 months.
And will notify the user with an icon besides url. By clicking the icon, user can proceed or stop & go to duckduckgo.
Manifest V2
- By:
- rosarp
- Daily users:
- 30
- Rating:
- 5.00 (2)
- Version:
- 1.1resigned1 Last updated: 2024-04-25
- Version code:
- 5728263
- Creation date:
- 2017-06-29
- Risk:
- High risk impact Moderate risk likelihood
- Permissions:
- storage
- webRequest
- webRequestBlocking
- activeTab
- tabs
- <all_urls>
- storage
- Size:
- 244.50K
- Email:
- ro*****@gmail.com
- Source:
- Firefox Browser Add-ons
- Updated:
- a day ago
Ranking
User reviews
by 天灭中共退党团队保平安, 2025-04-21
by 退出党团队远离中共邪教, 2025-03-16
I wish domain age could be displayed by default in the browser address bar.
by RA.AZ, 2023-05-16
Extension safety
Risk impact
WHOIS Check requires some sensitive permissions that could impact your browser and data security. Exercise caution before installing.
Risk impact analysis details
- Critical Grants access to browser tabs, which can be used to track user browsing habits and history, presenting a privacy concern.
- Critical ****** ****** ** *** ********* ****** * *********** ******** **** ** ** *** ******* *** ****** **** **** *** ******* *****
- High ****** *** ********* ** ******* *** ******* ******* ** ****** *** *** ******** ******
- High ******* ******* **** *** ****** ***** *** ***** ** ******* **** ********* ********* ** * *********** *****
Risk likelihood
WHOIS Check is probably trust-worthy. Prefer other publishers if available. Exercise caution when installing this add-on.
Risk likelihood analysis details
- High This extension has low user count. Unpopular extensions may not be stable or safe.
- Low **** ********* *** ******* **** **** * ****** **** ***** ******** *** **** ****** ** ** ****** *** *****
- Low **** ********* *** ***** **** **** * ****** **** ***** ********** *** **** ****** ** ** ****** *** *****
- Good **** ********* *** **** **** *******
Upgrade to see full risk analysis details
Compare add-ons
- Compare WHOIS Check vs Domain Checker
- Compare WHOIS Check vs Who Is Tab
- Compare WHOIS Check vs whoru
Similar add-ons
Here are some Firefox add-ons that are similar to WHOIS Check:

Domain Checker
HELLO88 - NHÀ CÁI CHẤT LƯỢNG

Who Is Tab
Rakesh Kumar

whoru
Brian

Asuka.IO Whois - Domain Name Lookup Tool
Asuka.Net

Whois Checker
Ahmet Erdem

SmartWhois Launcher
TamoSoft

Quick who is
GuilhermeRaposo

WebHosting Assistant Tools
Shayan Goudarzi

Domain Age Checker | Site Age Checker
chk7964
Popular extensions / apps
Here are some popular extensions / apps that you might be interested in:
vidIQ Vision for YouTube
https://http://vidiq.com/
Kiss Kiss: Spin the Bottle
PLAYNETA LIMITED
uBlock Origin Lite
Raymond Hill (gorhill)
Urban VPN Proxy
Urban VPN
Dark Reader
alexanderby

uBlock Origin
Raymond Hill
WhatsApp Business
WhatsApp LLC
Walmart: Shopping & Savings
Walmart
Wildberries
Wildberries LLC
Alibaba.com - B2B marketplace
Alibaba Mobile

Ghostery – Privacy Ad Blocker
Ghostery
Fishing Clash: Sport Simulator
Ten Square Games