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Firefox DuckDuckGo Privacy Essentials Extension NOT injecting CSS for Google Ads

addons.mozilla.org DuckDuckGo Privacy Essentials – Deze extensie downloaden voor 🦊 Firefox (nl)

Download DuckDuckGo Privacy Essentials voor Firefox. Privacy vereenvoudigd. Bescherm je gegevens wanneer je online informatie zoekt en browset met trackerblocking, slimmere versleuteling, privé zoeken en browsen, en meer.

DuckDuckGo Privacy Essentials – Deze extensie downloaden voor 🦊 Firefox (nl)

My questions are:

  • Does the DuckDuckGo Firefox extension "Privacy Essentials" add a local css file to every visited site?
  • Can others reproduce this?
  • Is this harmfull or not?

Background:

I have a simple static one page site with just one html and css file. It's completely tracker free. Debugging it a bit with developer mode (F12) on I discovered a second css file. This file isnt on my webserver but added local. To pinpoint what caused this I removed every add-on / extension in my browser one by one, reloading and checking my website every time. Took me a while because didnt expect this one causing it.

To reproduce:

  • Install the extension from the link.
  • Open a random site
  • Check in developer mode the tab Style editor.
  • Scroll and look for a file named %3Ais(%5Bid*%3D'google_ads_iframe'%5D%.css or something like that.
  • Remove the extension and refresh.
  • Check if the file disappears.

Content of the css file: :is([id*='google_ads_iframe'], [id*='taboola-'], .taboolaHeight, .taboola-placeholder, #credential_picker_container, #credentials-picker-container, #credential_picker_iframe, [id*='google-one-tap-iframe'], #google-one-tap-popup-container, .google-one-tap-modal-div, #amp_floatingAdDiv, #ez-content-blocker-container) { display:none!important; min-height:0!important; height:0!important; }

Edit 25-03-2024: Changed title to not give the wrong impression. See comments below.

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