Cross-site Request Leak Report
Firefox v65 (default settings)

To evaluate whether your current browser instance's cookie policies can be bypassed with one of the request mechanisms, simply click on the specific instance you want to test. This will open a new tab, where the test is set up and executed: the test will try to initiate a cross-site request to cross-site.com. After a few seconds, you will be redirected back to this page, showing the results of the test.

To analyze the correctness of your browser extension, make sure to mark the checkbox underneath.

Test with cross-site request that should be blocked by easylist.txt:

Request Mechanism

Redirects

form-GET, location-status-300, location-status-301, location-status-302, location-status-303, location-status-307, location-status-308, meta-refresh, redirect-winloc, refresh-header

CSS

after-content, background-image, before-content, border-image-source, cursor, escape-url, import-string, import-url, variables

JavaScript

event-source-credentials-include, fetch-credentials-include, fetch-GET-credentials-include, fetch-HEAD-credentials-include, fetch-POST-credentials-include, send-beacon, websocket, xhr-get-withCredentials, xhr-head-withCredentials, xhr-post-withCredentials

HTML elements

body-background, embed-src, iframe-src, iframe-src-data-svg-image-href, iframe-src-javascript-img-src, iframe-srcdoc-img-src, image-src, img-src, img-srcset, input-src, link-apple-touch-icon-precomposed, link-prefetch, link-shortcut-icon, link-stylesheet, object-data, picture-img-srcset, script-src, svg-feimage, svg-image-href, svg-image-xlink-href, svg-rect-cursor, svg-script-href, svg-script-xlink-href, table-background, td-background, video-poster, video-src

AppCache

appcache

Service worker

fetch-credentials-include, fetch-GET-credentials-include, fetch-HEAD-credentials-include, fetch-POST-credentials-include, refetch-through-innocent-script, websocket

Redirects

form-POST

Response headers

link-prefetch, link-stylesheet

CSS

font-face, font-face-fallback, shape-outside, svg---webkit-mask

JavaScript

event-source, fetch, fetch-GET, fetch-HEAD, fetch-POST, xhr-delete, xhr-delete-withCredentials, xhr-get, xhr-head, xhr-post, xhr-put, xhr-put-withCredentials

HTML elements

svg-inline-css--webkit-mask, svg-rect-mask

Service worker

fetch, fetch-GET, fetch-HEAD, fetch-POST

Response headers

csp-report-uri