---
id: mozversion
version: "2.4.0"
license: MPL
license_treatment: copyleft
maintenance: abandoned
---

# mozversion — Library to get version information for applications

License: copyleft · Maintenance: abandoned · Downloads: 247.8K/mo

## What it is and what it does

mozversion is a library that queries installed Mozilla applications (primarily Firefox) to retrieve their version and build information. It reads version metadata from the application's installation directory and returns structured version data.

The package is part of Mozilla's mozbase testing toolkit and is designed for automation and testing scenarios where you need to programmatically determine what version of Firefox or another Mozilla application is installed on a machine. It depends on mozlog for logging and six for Python 2/3 compatibility, though it has not been maintained since mid-2023.

Use it for:

- Automated testing workflows that need to verify which Firefox version is running before executing tests
- CI/CD pipelines that query installed application versions for build reports or compatibility checks
- Test infrastructure that must adapt behavior based on the detected Firefox version

## Worth the install?

AI-flagged interpretation of the facts above — verify before relying.

Extracts and reports version information from Firefox and other Mozilla applications on the local system.

No—avoid for new projects. The package is abandoned (1113 days since last release) and targets Python 2.7 and 3.5, both long out of support. While it has no known vulnerabilities and low install friction, the lack of maintenance means it will likely fail on current Firefox versions and modern Python environments. Use only if you are maintaining legacy test infrastructure that already depends on it.

## Install

pip install mozversion
uv add mozversion
poetry add mozversion

## Installing mozversion

Before you install: Low install friction with only two runtime dependencies (mozlog, six). However, the package is abandoned—last release was 1113 days ago with no ongoing maintenance, which raises concerns about compatibility with current Python versions and Firefox releases.

License in practice: Licensed under MPL (copyleft), which requires derivative works to be distributed under the same license but permits private use and modification without redistribution.

Quickstart:

pip install mozversion

from mozversion import get_version
version_info = get_version()

Requires a local Firefox or Mozilla application installation to query; the package is abandoned and may not work with current versions.

Verify before relying:

- Whether the package still works with current Firefox versions and modern Python releases (3.8+)
- Current status of the mozlog and six dependencies and their own maintenance
- Whether version detection logic remains accurate for recent Firefox builds

## Package facts

- License: MPL (copyleft)
- Python support: unspecified
- Install friction: low
- Maintenance: abandoned
- Downloads: 247.8K/month (top 15,000 on PyPI)
- Known vulnerabilities: none known

## Tags

firefox version detection, mozilla app version info, get application version, firefox version query, mozilla version library, mozilla-tools, abandoned

[View on SkillFed](https://skillfed.io/packages/mozversion) · [View on PyPI](https://pypi.org/project/mozversion/)