Referer Modifier

Referer Modifier

Modify the Referer header of HTTP requests: Remove, shorten, replace with custom data, or keep the Referer depending on the target domain.

What is Referer Modifier?

Referer Modifier is an efficient Firefox add-on meant for managing the HTTP Referer header. This add-on allows users to set up rules for each target domain, deciding whether to keep, prune, remove or replace the Referer. Users can also designate default actions for domain-based requests and those that don't match any existing rule. It offers easy JSON configuration import/export, and since version 0.8, allows for modification of the Javascript property document.referrer to align with changes.

Stats date:
Users: 864 ▲ 4
Rating: 3.97 (32)
Version: 1.1.0 (Last updated: 2022-11-09)
Creation date: 2017-11-03
Weekly download count: 35
Firefox on Android: No
Manifest version: 2
  • webRequest
  • webRequestBlocking
  • <all_urls>
  • storage
Size: 44.62K
URLs: Website
Risk impact: High risk impact
Risk likelihood: Low risk likelihood

Other platforms

Not available on Chrome
Not available on Edge

Referer Modifier lets you configure rules to decide what HTTP Referer header Firefox should send to a certain site, if any. For each target domain, one of five actions can be configured:

  • Keep: Do not modify the Referer
  • Prune: Send only the origin part of the Referer (scheme, host, and port)
  • Target: Send the origin of the target URL (scheme, host, and port) as Referer
  • Remove: Send no Referer at all
  • Replace: Replace the Referer with a configured value
You can configure default actions for requests originating from the same domain, and any other request not matching a domain rule. The "replace" and "target" actions will create a Referer header if necessary, the others only modify or remove existing ones. The configuration can be exported as and imported from JSON files.

Since version 0.8 the Javascript property document.referrer is modified to match.

User reviews
User reviews summary
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.
  • Helpful for navigating sites with referer-based access restrictions
  • Can replace the functionality of network.http.referer.XOriginPolicy in Firefox
  • Works well on privacy-focused configurations of Firefox
  • Seems to work on browsing platforms like Waterfox Classic despite being flagged as incompatible
  • Has been reported to work better than alternatives like RefControl
  • Cannot hide the referer FROM a specific website, only TO the targeted website
  • Lacks a 'Forge' option that the competitor RefControl has
  • Some users report that it doesn't work at all
  • One user reported it not working after upgrading Firefox
  • Does not block third-party referer
Most mentioned
  • Helps with Pixiv and other sites with similar restrictions
  • Lacks certain settings options compared to alternatives like RefControl and built-in Firefox options
  • It is considered unpolished by some users
  • Works in Privacy-focused configurations of Firefox
  • Issues with compatibility and function between different versions and configurations of browsers
View all user reviews
Risk impact

Referer Modifier is risky to use as it requires a number of sensitive permissions that can potentially harm your browser and steal your data. Exercise caution when installing this add-on. Review carefully before installing. We recommend that you only install Referer Modifier if you trust the publisher.

Risk likelihood

Referer Modifier has earned a fairly good reputation and likely can be trusted.

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