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aliases category classification date date_modified draft id image links local_archive_links pinned print series tags title type
disable-cross-origin-request-blocking-firefox
firefox
public
2020-09-25 10:50:47 -0700
2020-09-25 10:50:47 -0700
false
20200925175047
false
false
cors
firefox
javascript
Disable Cross-Origin Request Blocking on Firefox
tech-note

When testing something that uses JavaScript locally, you may come across an error like this:

Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at file://///wsl$/fedoraremix/home/jprice/my/documents/code/cloud-operations/aws-environment-details-webapp/js/data/aws-environments.json?_=1601052634622. (Reason: CORS request not http).

It's only an issue when running locally, but a quick and easy way to resolve it can be found in about:config on Firefox. The following preference should be set to false.

Warning

Make sure you set it back to true once you have finished testing.

security.fileuri.strict_origin_policy: false