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.
What is Content-Type Fixer?
'Content-Type Fixer' is a Firefox add-on that intervenes when Firefox does not correctly follow download instructions due to incorrect or generic Content-Type headers received from servers or forced downloads through a Content-Disposition. Utilizing this add-on, users can ensure Firefox respects their set preferences for downloads and file handling. It allows customizable corrections and offers functionality to fix naming errors caused by spaces in the Content-Disposition.
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Add-on stats

Users: 1,715 ▲ 91
Rating: 4.68 (41)
Version: 1.7.4.1 (Last updated: 2022-03-26)
Creation date: 2018-11-01
Weekly download count: 21
Firefox on Android: No
Risk impact: High risk impact
Risk likelihood: Low risk likelihood
Manifest version: 2
Permissions:
  • <all_urls>
  • webRequest
  • webRequestBlocking
  • storage
Size: 55.83K
URLs: Website

Ranking

# 2257 ▲ 59
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Other platforms

Not available on Chrome
Not available on Edge
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Add-on summary

Analyze keywords

You can find a new help page (for Firefox 98+) here: https://www.jeffersonscher.com/ext/content-type-fixer.html

Operation

This extension does not monitor downloads until you enable it. Use the toolbar button to turn listening on (shows a yellow burst) and off (shows Zzzz). (If you want it on automatically, there is a checkbox on the menu for that.)

Content-Type

The extension checks the file extension on new page and download requests to see whether they have a file extension that should be assigned a specific Content-Type header. (It doesn't look at requests for embedded items like images, audio, or video.)

Automatically corrects the Content-Type for these extensions: .acsm, .css, .csv, .doc/docx, .epub, .pdf, .ppt/pptx, .psd, .rar, .rtf, .xls/xlsx, .zip, and .7z. Some image and video formats can be enabled with a click.

To add more, turn on the extension, try to download a file that isn't being handled correctly, then open the Log of recent requests to find Add and Edit buttons to add a custom Content-Type. The log is not saved to disk and is flushed when you snooze the extension.

Content-Disposition

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User reviews

These summaries are automatically generated weekly using AI based on recent user reviews. Firefox Browser Add-ons does not verify user reviews, so some user reviews may be inaccurate, spammy, or outdated.
Pros
  • Successfully resolves issues with file types not being downloaded correctly.
  • Enables users to specify how certain file types should be handled in Firefox.
  • Improves user experience by fixing long-standing issues with default Firefox behavior.
Cons
  • Some users report issues with unwanted behavior, such as content being replaced by unrelated downloads.
  • Not all users find it effective, with some stating it doesn't work as expected.
Most mentioned
  • It helps with file types like .bib, .md, .acsm, and .Epub.
  • Users express gratitude for fixing long-standing issues.
  • There are reports of the extension causing problems with other functionalities in Firefox.
Recent reviews
by Hollytryx, 2024-10-28
Thanks. I eventually got my .bib files opened by the correct application instead of being managed with the default Firefox option.
by Firefox user 17926829, 2023-06-02
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Add-on safety

Risk impact

Content-Type Fixer requires some sensitive permissions that could impact your browser and data security. Exercise caution before installing.

Risk likelihood

Content-Type Fixer has earned a fairly good reputation and likely can be trusted.

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