Saving detailed benchmarks fails due to CORS on Firefox 70

[blw043]

• User agent string: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:70.0) Gecko/20100101 Firefox/70.0
• Firefox 70.0.1
• Installed extensions: ScriptSafe (1.0.9.8), Decentraleyes (2.0.13), uBlock Origin (1.23.0), Tampermonkey (4.9.5941; no active userscripts), Multiple Tab Handler (3.0.10)

After whitelisting all scripts on the site, I can create and run quick benchmarks with no issues. However, after creating a detailed benchmark and attempting to save it, the save operation never completes. The following appears in the Firefox web console.

[WARNING] Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at https://www.omaralshaker.com/perf.zone/bs.php. (Reason: CORS header ‘Access-Control-Allow-Origin’ missing).
[ERROR] TypeError: NetworkError when attempting to fetch resource.