Content-Type Fixer

Name: Content-Type Fixer
Rating: 4.6977 (43 reviews)
Author: jscher2000

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.

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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.

Developer Tools Productivity Privacy & Security

By:

Daily users:

Rating:

Version:

1.7.5 Last updated: 2025-04-22

Version code:

5934848

Creation date:

2018-11-01

Risk:

Permissions:

<all_urls>
webRequest
webRequestBlocking
storage

Size:

56.09K

Email:

js*****@outlook.com

URLs:

Website

Full description:

Source:

Firefox Browser Add-ons

Updated:

a day ago

Ranking

# 2,231 ▲ 18

Other rankings

#195 in Download Management ▲ 1

#6 in bug fixes keyword 20

#16 in typing keyword 28 ▲ 1

#35 in concert keyword 5

#35 in instruction keyword 3 ▼ 3

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User reviews

Content-Type Fixer is highly regarded by users for resolving multiple frustrating file handling issues in Firefox, allowing files with uncommon or misassigned MIME types to open or download correctly. Users commonly praise it as a vital solution restoring necessary file management features that Firefox lacks. However, some have experienced failures with certain file extensions and concerns about unwanted behaviors or additional manual cleanup. Overall, it is seen as essential for fixing Firefox's limitations but may have inconsistent results in some edge cases.

Pros

Effectively fixes content-type issues to allow correct handling and opening of various file types like .bib, .docx, .md, .acsm, .mkv, and .epub.
Restores missing functionality in Firefox for managing file download and opening behaviors that users need.
Many users found the add-on a "life saver" because it resolved longstanding frustrating problems with file handling in Firefox.
Allows users to add or edit content types that Firefox does not handle properly by default.
Provides a workaround for Firefox's limited built-in application handler settings, improving user control over downloads.

Cons

Some users reported that the add-on did not work for certain file types or use cases, such as .adi files not saving correctly with extensions after Firefox updates.
One review mentioned potential unwanted behavior (PUP) like content replacement with Mediafire downloads even when the extension is off, indicating possible malware or conflict issues.
The add-on requires manual management of temporary files for some content types, leading to cluttered download directories.
Some users lament that the need for such extensions highlights ongoing deficiencies in Firefox's native file handling and design choices.
Lack of functionality or failure in some scenarios was reported but these issues are not widespread.

Recent reviews

love it

by Firefox user 18843449, 2025-05-04

by palota, 2025-01-14

by Hollytryx, 2024-10-28

View all user reviews ›

Extension safety

Risk impact

Content-Type Fixer requires a few sensitive permissions. Exercise caution before installing.

Risk impact analysis details

Critical Allows access to all websites, posing a significant security risk as it can monitor and modify data from any visited site.
High ****** *** ********* ** ******* *** ******* ******* ** ****** *** *** ******** ******

Risk likelihood

Content-Type Fixer is probably trust-worthy. Prefer other publishers if available. Exercise caution when installing this add-on.

Risk likelihood analysis details

High This extension was recently updated in the past month. New updates may not be stable or safe.
High **** ********* *** *** **** ****** ********* ********** *** *** ** ****** ** *****
Low **** ********* *** ***** **** **** * ****** **** ***** ********** *** **** ****** ** ** ****** *** *****
Good **** ********* *** **** **** *******

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