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Using system wide proxy setting in Linux

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I have the HTTP_PROXY, HTTPS_PROXY and FTP_PROXY (and their lowercase counterparts) exported and then the firefox binary is started from the shell script. The settings in firefox say it will 'Use system proxy settings'. Nevertheless I do not see the proxy being used as I can not access the web pages that need the proxy. The 'about:config' also does not show that firefox picked up any proxy related information from the shell environment.

I know the proxy address is correct because if I use brave browser instead of firefox (same shell script that launches brave) I can reach the web pages behind the proxy as expected.

I have the HTTP_PROXY, HTTPS_PROXY and FTP_PROXY (and their lowercase counterparts) exported and then the firefox binary is started from the shell script. The settings in firefox say it will 'Use system proxy settings'. Nevertheless I do not see the proxy being used as I can not access the web pages that need the proxy. The 'about:config' also does not show that firefox picked up any proxy related information from the shell environment. I know the proxy address is correct because if I use brave browser instead of firefox (same shell script that launches brave) I can reach the web pages behind the proxy as expected.

Chosen solution

If your proxy is set up in the following format: "<proxy_user>:<proxy_password>@<proxy_host>", you have to add a scheme (http://).

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If the 'Manual proxy configuration' is used instead I can access the web pages behind the proxy. But this is not what I want to do; I would like firefox to pick up the system wide proxy settings.

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Chosen Solution

If your proxy is set up in the following format: "<proxy_user>:<proxy_password>@<proxy_host>", you have to add a scheme (http://).

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I only have "<proxy_host>:<proxy_port>". Nevertheless adding "http://" in front of it solved the issue for me.

Would be really nice if this was documented somewhere (apologizes if it is , but I couldn't spot it)..