Unit Converter

Name: Unit Converter
Author: Moshi

By: Moshi

Select any text on a webpage containing a measurement and instantly see it converted in a tooltip. No clicking, no copy-pasting into a converter site.

Download

Install

Features & Capabilities

Unit Converter — Firefox Extension

Select any text on a webpage containing a measurement and instantly see it converted in a tooltip. No clicking, no copy-pasting into a converter site.

Features

Weights — kg, g, mg, lb, lbs, oz, stone, ton, tonne
Distances — km, m, cm, mm, miles, yards, feet/ft/', inches/in/" (including compound 5'10" notation)
Temperatures — °F, °C, K — shows both other scales simultaneously
Currency — symbol prefixes ($, £, €, ¥, …) and ISO codes (USD, EUR, GBP, …) — converts to your chosen target currency using live exchange rates

Just select text and the tooltip appears above the selection automatically.

Installation

Install from the Firefox Add-ons store.

Or load it manually for development — see Development below.

Usage

Select any text on a webpage that contains a measurement, e.g.:
72°F → 22.222 °C | 295.372 K
6'2" → 187.96 cm | 1.88 m
180 lbs → 81.647 kg
$49.99 → 46.23 EUR (using live rates)
A tooltip appears above the selection with the converted value(s).
Click the toolbar icon to choose your target currency and refresh exchange rates.

Settings

Click the extension icon in the Firefox toolbar to open the settings popup:

Target Currency — choose from 35+ currencies; conversions update immediately
Refresh Exchange Rates — fetches the latest rates from open.er-api.com. Rates are also refreshed automatically every 6 hours.

User Growth & Download Statistics

Add-on

By:

Moshi

Daily users:

Version:

1.0.1 Last updated: 2026-05-05

Version code:

6244385

Creation date:

2026-05-02

Risk:

Permissions:

Content scripts matches:

<all_urls>

Size:

21.55KB

URLs:

Website

Full description:

Source:

Firefox Add-ons Store

Data ingested on:

2026-06-03

Compare stats and ranking:

Ranking

# 97,185 ▲ 229

Other rankings

#168 in temperature keyword 17 ▼ 2

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:

Moshi

Firefox Add-ons Store

https://addons.mozilla.org/firefox/addon/unit-converter4/

Website:

https://github.com/MoshiBin/firefox-converter

Is Unit Converter 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.

Unit Converter 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.
High ******* ******* **** *** ****** ***** *** ***** ** ******* **** ********* ********* ** * *********** *****

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.

Unit Converter 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 **** ********* *** *** **** ****** ********* ********** *** *** ** ****** ** *****
Medium **** ********* *** ***** ** *** **** * ******* *** ********** *** *** ** ****** ** *****