# Content-Type Fixer

> Firefox doesn't follow instructions for downloads? "Always Open Similar Files" is missing? This usually happens because the server sent Firefox a wrong/generic Content-Type header, or forces a download with Content-Disposition. Here's a fix.

Canonical page: [https://chrome-stats.com/d/content-type-fixer](https://chrome-stats.com/d/content-type-fixer)

## Overview

- **ID:** `content-type-fixer`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** jscher2000
- **Category:** download-management
- **Daily users:** 1,590
- **Weekly downloads:** 46
- **Rating:** 4.71 / 5 (45 ratings)
- **Version:** 1.7.5
- **Last updated:** 2025-04-22
- **First published:** 2018-11-01
- **Size:** 55 KB
- **Data as of:** 2026-09-09
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/content-type-fixer/)
- **Website:** [https://github.com/jscher2000/Content-Type-Fixer-extension/issues](https://github.com/jscher2000/Content-Type-Fixer-extension/issues)

## Description

Content-Type Fixer is a Firefox extension designed to fix download issues caused by incorrect or generic Content-Type headers and problematic Content-Disposition settings. When enabled, it monitors downloads and automatically corrects Content-Type headers for common file extensions like .pdf, .zip, .docx, .xlsx, .pptx, and more, ensuring files open or download properly without manual intervention.

The extension also addresses errors with spaces in Content-Disposition filenames that can cause truncated download names. Users can toggle the extension's monitoring on and off with a toolbar button and customize Content-Types for additional file types via a log interface. Optional settings allow forcing inline or attachment download behavior to streamline file handling. This tool is particularly useful for users encountering download issues in Firefox due to server misconfiguration or inconsistent header information.

## Rankings

- #2,509 — Overall
- #218 — Download Management
- #8 — bug fixes
- #23 — typing
- #34 — instruction
- #36 — concert

## Permissions and access

### Permissions

- `<all_urls>`
- `webRequest`
- `webRequestBlocking`
- `storage`

## Safety

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

## Review summary

Content-Type Fixer is highly praised for resolving Firefox's inadequate default handling of file types, allowing proper download and opening of diverse files like .bib, .docx, .epub, and markdown files. Users appreciate its ability to add missing content-type configurations, effectively addressing long-standing Firefox deficiencies. However, some issues persist, such as occasional malfunction for certain file extensions, side effects like unwanted content replacement on some websites, and manual cleanup of temporary files. Overall, it's considered a vital and life-saving tool for users facing these problems in Firefox.

### Pros

- Effectively fixes file type and content-type handling issues in Firefox, enabling correct opening and downloading of various file extensions such as .bib, .docx, .mkv, .acsm, .epub, and markdown (.md) files.
- Resolves longstanding user frustrations with Firefox's default application associations and missing content-type handling features.
- Allows users to customize or add new content types, improving download and open behaviors for unsupported or incorrectly handled file types.
- Saves time and effort by automating content type adjustments, preventing loops or improper file handling.
- Highly appreciated by users who faced critical usability problems and have been searching for a solution for a long time.

### Cons

- One review mentioned a potential issue where content on some websites was replaced with a Mediafire download even when the extension was off, indicating possible unwanted behavior or a potentially unwanted program (PUP) trait.
- Some users reported it did not work for specific file types or situations, such as saving .adi files without the extension, possibly due to Firefox updates.
- Requires manual management of temporary files for automatically opened downloads (e.g., .acsm files), adding some minor user overhead.

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Source: [Chrome-Stats](https://chrome-stats.com/d/content-type-fixer)