October 4, 2023


Your Partner in The Digital Era

New Firefox privateness function strips URLs of tracking parameters

Mozilla Firefox 102 was released nowadays with a new privateness element that strips parameters from URLs that are utilized to observe you all-around the internet.

Several companies, including Fb, Marketo, Olytics, and HubSpot, utilize tailor made URL query parameters to track clicks on back links.

For illustration, Fb appends a fbclid query parameter to outbound backlinks to monitor clicks, with an illustration of a single of these URLs demonstrated down below.


With the launch of Firefox 102, Mozilla has added the new ‘Query Parameter Stripping’ characteristic that mechanically strips a variety of query parameters made use of for monitoring from URLs when you open them, whether or not that be by clicking on a hyperlink or only pasting the URL into the handle bar.

After enabled, Mozilla Firefox will now strip the next tracking parameters from URLs when you click on on hyperlinks or paste an URL into the deal with bar:

  • Olytics: oly_enc_id=, oly_anon_id=
  • Drip: __s=
  • Vero: vero_id=
  • HubSpot: _hsenc=
  • Marketo: mkt_tok=
  • Fb: fbclid=, mc_eid=

To illustrate how this functions, BleepingComputer made a take a look at webpage made up of backlinks to instance.com with the above tracking parameters.

As you can see down below, when I click on the connection for https://case in point.com/?fbclid=12, it opens https://case in point.com but with the tracking parameter taken off.

Demonstration of the Firefox Query Stripping feature
Demonstration of the Firefox Question Stripping attribute
Supply: BleepingComputer

Even though this is a wonderful commence, there are additional trackers that are not being filtered, which privateness-concentrated Courageous Browser presently blocks.

How to permit the new privacy aspect

The new Question Parameter Stripping aspect is element of Firefox’s Enhanced Tracking Security.

To enable Query Parameter Stripping, go into the Firefox Options, click on Privateness & Stability, and then transform ‘Enhanced Monitoring Protection’ to ‘Strict.’ 

Mozilla Firefox's Enhanced Tracking Protection set to Strict
Mozilla Firefox’s Enhanced Tracking Safety established to Stringent
Resource: BleepingComputer

However, these monitoring parameters will not be stripped in Non-public Method even with Stringent method enabled.

To also allow the feature in Private Manner, enter about:config in the address bar, look for for strip, and set the ‘privacy.question_stripping.enabled.pbmode‘ possibility to correct, as shown down below.

Enable privacy.query_stripping.enabled.pbmode setting
Enable privacy.query_stripping.enabled.pbmode environment
Source: BleepingComputer

It must be pointed out that location Increased Monitoring Security to Rigid could lead to issues when utilizing particular websites. 

If you enable this function and uncover that websites are not doing work accurately, just set it back again to Conventional (disables this characteristic) or the Personalized setting, which will require some tweaking.