Hello and thank you for the test extension and the detailed steps to reproduce the issue !
I’ve reproduced the bug on the latest Nightly (154.0a1/20260712214442), Beta (153.0b11/20260710112311) and Release (152.0.5/20260706120035) under Windows 11 and Ubuntu 25.10.
Performing the STR logs the following in the extension popup:
```
{
"ok": false,
"url": "http://127.0.0.1:8765/",
"error": "TypeError: NetworkError when attempting to fetch resource.",
"note": "This NetworkError, despite a granted host permission for this origin, is the behavior reported in bug 2052000."
}
```
The browser console also shows a `Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at http://127.0.0.1:8765/. (Reason: CORS header ‘Access-Control-Allow-Origin’ missing). Status code: 200.` error.
Bug 2052000 Comment 7 Edit History
Note: The actual edited comment in the bug view page will always show the original commenter’s name and original timestamp.
Hello and thank you for the test extension and the detailed steps to reproduce the issue !
I’ve reproduced the bug on the latest Nightly (154.0a1/20260712214442), Beta (153.0b11/20260710112311) and Release (152.0.5/20260706120035) under Windows 11 and Ubuntu 25.10.
Performing the STR logs the following in the extension popup:
```
{
"ok": false,
"url": "http://127.0.0.1:8765/",
"error": "TypeError: NetworkError when attempting to fetch resource.",
"note": "This NetworkError, despite a granted host permission for this origin, is the behavior reported in bug 2052000."
}
```
The browser console also shows a `Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at http://127.0.0.1:8765/. (Reason: CORS header ‘Access-Control-Allow-Origin’ missing). Status code: 200.` error.