Firefox
Firefox can take an authenticated HTTP proxy directly in Settings. Point it at Proxy Charm.
Setup
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Copy credentials from the dashboard
Sign in to Proxy Charm and open Proxies. Copy the host, port, username, and password for your workspace.
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Open Network Settings
Settings → General → Network Settings → Settings…
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Manual proxy configuration
Select Manual proxy configuration. HTTP Proxy zephyr.proxy.rlwy.net, Port 15112. Check Also use this proxy for HTTPS. Leave SOCKS empty.
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Authenticate when prompted
Load any page. Enter your workspace username and password in the Firefox proxy authentication dialog.
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Confirm the exit IP
With the proxy on, open https://api.ipify.org in Firefox. The address shown should match the residential exit listed for that slot in the dashboard.