Using System Proxy Settings in Firefox

When configuring your system's proxy settings, it can be beneficial to have all applications use these settings automatically. This includes not just web browsers like Firefox, but also other software such as Git, npm, and Dropbox. In this article, we will explore how to set up system-wide proxy settings in Firefox and other applications.

One method for setting system-wide proxy settings is by using the export command in your shell script. For example, you can create a script called 'proxy.sh' inside the '/etc/profile.d/' directory and add the following lines:

```

export http_proxy=http://your-proxy:port

export https_proxy=http://your-proxy:port

export no_proxy=localhost,127.0.0.1,

```

Replace 'http://your-proxy:port' with your actual proxy server address and port number.

Another option is to use a tool like ProxyMan- Git AUR, which claims to make configuring system-wide proxy settings easy. This can be particularly helpful when using a desktop environment that does not provide an option for proxy configuration, such as XFCE.

Some programs, including wget and CURL, use environment variables of the form 'protocol_proxy' to determine the proxy for a given protocol (e.g., http_proxy). To make these environment variables available everywhere, you can add them to a script like 'proxy.sh' inside the '/etc/profile.d/' directory.

In addition to setting up system-wide proxy settings, you may also need to configure your browser's proxy settings. Firefox, in particular, allows you to set its proxy settings by going to the 'Options' menu, selecting 'Advanced,' and then clicking on the 'Network Settings' button.

When debugging HTTPS connections, it can be useful to intercept them outside of the browser using a tool like sslsplit, mitmproxy, or microsocks. These tools work with any TLS connections but cannot act as a HTTP proxy in a browser. For a graphical interface and API, you may want to consider using Fiddler or Charles.

Remember that when setting up TLS MITM (Man-in-the-middle), you need to trust the certificate authority of the proxy either in your browser or system-wide. This is because the proxy needs to be able to intercept and decrypt the HTTPS traffic.

In conclusion, configuring system-wide proxy settings can be a simple process by using the export command in your shell script or by using tools like ProxyMan- Git AUR. By setting up these settings correctly, you can ensure that all applications on your system use the same proxy settings automatically.

Use system proxy settings firefox