# Open PDF in Default PDF Reader (Instead of FF)

> Open PDF links in your system's default PDF reader instead of the built-in browser viewer. Use Acrobat, Sumatra, Preview, or any external app with one click.

Canonical page: [https://chrome-stats.com/d/open-ff](https://chrome-stats.com/d/open-ff)

## Overview

- **ID:** `open-ff`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** Keven Lee
- **Category:** download-management,appearance
- **Daily users:** 409
- **Weekly downloads:** 150
- **Rating:** 5.00 / 5 (7 ratings)
- **Version:** 3.5.0
- **Last updated:** 2026-07-12
- **First published:** 2026-06-24
- **Size:** 57 KB
- **Data as of:** 2026-09-10
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/open-ff/)

## Description

Want PDFs to open in Adobe Acrobat, Sumatra PDF, Preview, or another app you already use?

This extension sends PDF links to your computer's default PDF reader instead of the built-in browser viewer.
<ul><li>Open PDFs externally in one click</li><li>Use familiar tools for annotate, search, and print</li><li>Control when links stay inline or launch outside</li><li>Works on common direct PDF links and downloads</li></ul>
Install once and read documents the way you prefer.

## Rankings

- #5,612 — Overall
- #2 — pdf
- #62 — defi
- #62 — reader
- #122 — header
- #130 — open vpn

## Permissions and access

### Permissions

- `storage`
- `contextMenus`
- `notifications`
- `nativeMessaging`
- `downloads`
- `activeTab`
- `alarms`
- `declarativeNetRequest`

### Host permissions

- `*://*/*`

### Content script matches

- `<all_urls>`

## Safety

- **Risk impact:** High risk impact
- **Risk likelihood:** High risk likelihood

### Analysis details

- Allows access to all websites, posing a significant security risk as it can monitor and modify data from any visited site.
- 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/open-ff)