Update README.md

Added warning about Firefox HTTP proxy bug

Author: mandatoryprogrammer

README.md

@@ -41,6 +41,7 @@ This is also especially useful for locked down orgs that make use of [Chrome OS]
 - `127.0.0.1:4343`: Websocket server, used for communicating with victim Chrome instances to transfer HTTP requests for proxying and sending commands.
 - `127.0.0.1:8118`: Admin web panel for viewing victim Chrome instances and getting HTTP proxy credentials.
 
+**IMPORTANT**: If you are proxying through CursedChrome using **Firefox** please use [FoxyProxy](https://addons.mozilla.org/en-US/firefox/addon/foxyproxy-standard/). The built-in proxy support for Firefox has bugs in its implementation of authenticated HTTP proxies which will drive you to madness.
 
 # Requirements
 
@@ -80,6 +81,8 @@ You will need to install this CA into your root store, the following are instruc
 * [Linux](https://thomas-leister.de/en/how-to-import-ca-root-certificate/)
 * [Firefox (any OS)](https://support.securly.com/hc/en-us/articles/360008547993-How-to-Install-Securly-s-SSL-Certificate-in-Firefox-on-Windows)
 
+**IMPORTANT**: If you are proxying through CursedChrome using **Firefox** please use [FoxyProxy](https://addons.mozilla.org/en-US/firefox/addon/foxyproxy-standard/). The built-in proxy support for Firefox has bugs in its implementation of authenticated HTTP proxies which will drive you to madness.
+
 ## Setting Up the Example Chrome Extension Implant
 
 To install the example chrome extension implant, do the following:
@@ -132,4 +135,4 @@ These topics are outside of the scope of this README, but eventually will be cov
 ## Attributions
 
 * The [AnyProxy source code](https://github.com/alibaba/anyproxy) was heavily modified and used for part of this project.
-* The icon for this project was designed by [`monochromeye`](https://www.fiverr.com/monochromeye) on Fiverr (paid), if you're looking for graphic design work check her services out.
+* The icon for this project was designed by [`monochromeye`](https://www.fiverr.com/monochromeye) on Fiverr (paid), if you're looking for graphic design work check her services out.