chrome://favicon2 permission for component extensions

[Arif Siddique]

Hi Chromium devs,
I'm looking to access chrome://favicon2 from component extensions page.

I'm getting below error -
"Not allowed to load local resource: chrome://favicon2/https://www.google.com/"

I have added chrome://favicon2 in allowed list of CSP in the component extension manifest. It is been mentioned that component extensions get access to chrome://* scheme by default.

I would really appreciate if anybody can provide pointers.

Thanks in advance,
Arif 

[Demetrios Papadopoulos]

See FaviconSource::ShouldServiceRequest at [1], which forwards to [2]. It does not seem that chrome-extension:// URLs are currently accepted by the FaviconSource ot [2].

[1] https://source.chromium.org/chromium/chromium/src/+/main:chrome/browser/ui/webui/favicon_source.cc;l=217-218;drc=8e00960d380b79da137b8a674c2c860361011502

[2] https://source.chromium.org/chromium/chromium/src/+/main:content/public/browser/url_data_source.cc;l=141-142;drc=0b4c01de4879deb0e3b288e3732641d1d9e343c9

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[warmhug]

Hey guys, is there a solution to this problem now?

[Liam Bowen]

The solution for an extension is to use the  magical    chrome-extension://<id>/_favicon/ URL. Unfortunately the samples are wrong and the documentation is sparse, but I have a PR open right now to fix the docs: https://github.com/GoogleChrome/chrome-extensions-samples/pull/771/files

The rest of the files are correct (remember to add the _favicon path to the web accessible resources and the correct permission): https://github.com/GoogleChrome/chrome-extensions-samples/tree/main/api/favicon