# Use the USPS postage calculator w/o its Javascript

> Allows you to use the USPS postage price calculator at postcalc.USPS.com on IceCat without disabling LibreJS or running the website's Non-free Javascript.

Canonical page: [https://chrome-stats.com/d/librejs-usps-compatibility](https://chrome-stats.com/d/librejs-usps-compatibility)

## Overview

- **ID:** `librejs-usps-compatibility`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** NateN1222
- **Category:** privacy-security
- **Daily users:** 3
- **Rating:** 5.00 / 5 (1 ratings)
- **Version:** 1.1resigned1
- **Last updated:** 2024-04-25
- **First published:** 2017-06-08
- **Size:** 19 KB
- **Data as of:** 2026-09-12
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/librejs-usps-compatibility/)
- **Website:** [http://0xbeef.coffee](http://0xbeef.coffee/)

## Description

Use the USPS postage price calculator at postcalc.USPS.com on IceCat without disabling LibreJS or running the website's Non-free Javascript. This add-on assumes you are running LibreJS and was tested on the latest version of GNU IceCat, a version of Firefox.

## Rankings

- #53,772 — Overall
- #41 — javascript
- #154 — calculator
- #179 — calculus

## Permissions and access

### Permissions

- `webRequest`
- `webRequestBlocking`
- `*://www.postcalc.usps.com/*`

### Content script matches

- `postcalc.usps.com`

## Safety

- **Risk impact:** Moderate risk impact
- **Risk likelihood:** Moderate risk likelihood

### Analysis details

- Allows the extension to observe and analyze traffic in flight for the selected hosts.
- This extension support email may not be valid

> Some risk analysis details are omitted from this free response. [Upgrade to view the full analysis](https://chrome-stats.com/pricing).

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Source: [Chrome-Stats](https://chrome-stats.com/d/librejs-usps-compatibility)