# SPDX License Diff

> Diff selected text against SPDX licenses

Canonical page: [https://chrome-stats.com/d/spdx-license-diff](https://chrome-stats.com/d/spdx-license-diff)

## Overview

- **ID:** `spdx-license-diff`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** Alan Tse
- **Category:** web-development,other
- **Daily users:** 18
- **Rating:** 5.00 / 5 (1 ratings)
- **Version:** 0.13.1
- **Last updated:** 2026-06-19
- **First published:** 2019-07-05
- **Size:** 180 KB
- **Data as of:** 2026-09-11
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/spdx-license-diff/)
- **Website:** [https://github.com/spdx/spdx-license-diff/issues](https://github.com/spdx/spdx-license-diff/issues)

## Description

SPDX License Diff is an open source Firefox add-on that compares selected text against the SPDX License List. It provides the closest matching license and shows differences against the canonical SPDX license text. Useful for identifying open source licenses and determining if they have been changed.

## Rankings

- #25,722 — Overall
- #1 — license

## Permissions and access

### Permissions

- `storage`
- `unlimitedStorage`
- `contextMenus`
- `activeTab`
- `scripting`

### Host permissions

- `*://*.spdx.org/*`

## Safety

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

### Analysis details

- Request access to the following domains: spdx.org
- This extension has low user count. Unpopular extensions may not be stable or safe.

> 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/spdx-license-diff)