Blocked: Storage access requests from trackers

A request to access cookies or storage was blocked because the browser identified it as coming from a tracker and content blocking is enabled.

Message

Firefox:

Request to access cookie or storage on “X” was blocked because it came from a tracker and content blocking is enabled.

What can be done

The permission can be changed or removed by:

• Going to Preferences > Privacy & Security > Enhanced Tracking Protection and either
  • adding an exception with the Manage Exceptions… button
  • choosing the Custom Content Blocking option and unchecking the Tracking content checkbox

If the blocked resource doesn't need authentication, you can fix the warning message by adding a crossorigin="anonymous" attribute to the relevant element.

See also

• Enhanced Tracking Protection in Firefox for desktop on support.mozilla.org
• The crossorigin attribute