I have installed the extension on the latest Chromium (Version 120.0.6099.71 (Official Build) (64-bit)), after adding a SOCKS5 proxy with user/pass authentication and enabling it all connections fail with the following message.

The proxy is from Private Internet Access (more information on hostnames/IPs/ports here https://helpdesk.privateinternetaccess.com/kb/articles/do-you-offer-a-socks5-proxy), I've exported my working configuration from Firefox and imported it into chromium, so the proxy itself is working just fine on the same version of FoxyProxy on Firefox. I've also tried the proxy manually with curl and it works fine as expected.

Here is another screenshot showing the exact same FoxyProxy config on both Firefox and Chromium, and the proxy only working with Firefox:

Things I've tried without success:

• Reinstalling Chromium
• Creating a new fresh Chromium profile
• Disabling/enabling WebRTC in Chromium flags and extension checkbox
• Disabling/enabling Proxy DNS
• Reinstalling the extension
• Adding the proxy manually instead of importing FoxyProxy settings from Firefox

If there is any additional log or information I can provide I'd be happy to do so. OS is Windows 10 x64.