Claude API Tester

Name: Claude API Tester
Author: Eric

By: Eric

Send test requests to the Anthropic Claude API from your browser. Prefilled Messages API template, x-api-key header auth, response inspector, request history.

Download

Install

Features & Capabilities

Claude API Tester is a lightweight REST client preconfigured for the Anthropic Messages API.

Features:

Prefilled Messages API request template with required headers
x-api-key and anthropic-version header support
Syntax-highlighted JSON responses
Request history with search and restore
Import and export cURL commands
Test streaming and non-streaming requests

Your API key never leaves your browser - requests go directly from the extension to api.anthropic.com.

User Growth & Download Statistics

Add-on

By:

Eric

Daily users:

Version:

1.0.0 Last updated: 2026-06-13

Version code:

6300662

Creation date:

2026-06-10

Risk:

Permissions:

storage
<all_urls>

Size:

47.52KB

Email:

er*****@proton.me

Full description:

Source:

Firefox Add-ons Store

Data ingested on:

2026-07-05

Compare stats and ranking:

Ranking

# 152,143 ▼ 8,352

Other rankings

#142 in claude ai keyword 39 ▼ 2#147 in claude keyword 65 ▼ 6

For Developers

Monetize with App Pass Boost with Extension Booster

Contact the developer

Chrome-Stats does not own this Firefox add-on. Please use these information below to contact the Firefox add-on developer.

Developed by:

Eric

Firefox Add-ons Store

https://addons.mozilla.org/firefox/addon/claude-api-tester/

Email:

er*****@proton.me

Is Claude API Tester Safe?

Risk impact

Risk impact measures the level of extra permissions an extension has access to. A low risk impact extension cannot do much harms, whereas a high risk impact extension can do a lot of damage like stealing your password, bypassing your security settings, and accessing your personal data. High risk impact extensions are not necessarily malicious. However, if they do turn malicious, they can be very harmful.

Claude API Tester requires a few sensitive permissions. Exercise caution before installing.

Risk impact analysis details

Critical Allows access to all websites, posing a significant security risk as it can monitor and modify data from any visited site.

Risk likelihood

Risk likelihood measures the probability that a Firefox add-on may turn malicious. This is determined by the publisher and the Firefox add-on reputation on Firefox Add-ons Store, the amount of time the Firefox add-on has been around, and other signals about the Firefox add-on. Our algorithms are not perfect, and are subject to change as we discover new ways to detect malicious extensions. We recommend that you always exercise caution when installing a Firefox add-on.

Claude API Tester is recently added, and hasn't been around long enough for us to gather enough data to accurately assess its risk level.

Risk likelihood analysis details

High This extension was recently updated in the past month. New updates may not be stable or safe.
High **** ********* *** ******** ****** *** ********** *** *** ** ****** ** *****
High **** ********* *** *** **** ****** ********* ********** *** *** ** ****** ** *****