Issue Summary

Inside Forge custom UI iframes, requests to some icon URLs, e.g., Confluence space icons, respond with 404 errors on Firefox if the icons are not cached or not publicly accessible.

Steps to Reproduce

1. Install the latest (126.0.1) stable version of Firefox.
2. Double-check that "Enhanced Tracking Protection" is turned on.
3. Call from the Forge app e.g.

requestConfluence("/wiki/api/v2/spaces?include-icon=true")

1. Display the icon from point 3.

Expected Results

Icons should work as before or when Tracking protection is off.

Actual Results

Workaround

You can disable this feature as described on the page:

https://support.mozilla.org/en-US/kb/enhanced-tracking-protection-firefox-desktop#w_what-to-do-if-a-site-seems-broken