Both Microsoft Edge (duhhh) and Google Chrome use credentials stored in Windows Credential Manager (for proxy authentication). Firefox uses his internal Password Manager. Is there a way to make Firefox use Windows Credential Manager (for proxy authentication) instead of Password Manager? Some setting in about:config or even better in Firefox GPO? My organization is split between general and production environments with separated Domains (without trust relationship) for each of those environments. Our Proxy server is a part of general environment. When users (every six months) change their passwords in general Domain, they can easily (through our custom internal application) save those new credentials in Windows Credential Manager (for "proxy.company.local", "proxy.company.local:8080" and "proxy.company.local:443"). Unfortunately Firefox doesn't seem to support credentials saved inside Windows Credential Manager and that is the only reason we do not use Firefox inside our production environment. If there is a way to tell Firefox to use Windows Credential Manager instead of Password Manager, I would be grateful if you could tell me how. If there is no way to do this now, and if someone from the development team is reading this, it would be nice if future versions of Firefox could support this.