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Use Proxy with Authorization in Firefox with Selenium in Python

How to provide Username and Password to a proxy server in Firefox with selenium in python?
I tried the code below but the IP address doesn't change. I check the proxy setting in Firefox, it shows that only http proxy is changed, but not https.
proxy = {'host': '111.111.111.11',
'port': 8080,
'usr': USERNAME,
'pwd': PASSWORD
}
profile = webdriver.FirefoxProfile()
profile.set_preference("network.proxy.type", 1)
profile.set_preference("network.proxy.http", proxy['host'])
profile.set_preference("network.proxy.https", proxy['host'])
profile.set_preference("network.proxy.http_port", proxy['port'])
profile.set_preference("network.proxy.username", proxy['usr'])
profile.set_preference("network.proxy.password", proxy['pwd'])
profile.update_preferences()
driver = webdriver.Firefox(firefox_profile=profile)
driver.get('https://whatismyipaddress.com')
I see a solution for ChromeDriver (but I don't test it because I can only use Firefox):
chrome_options = webdriver.ChromeOptions()
chrome_options.add_argument('--proxy-server=196.19.8.80:8000')
chrome_options.add_argument('--proxy-auth=yjd5Rn:29apJZ')
chrome = webdriver.Chrome(chrome_options=chrome_options)
chrome.get("http://whatismyipaddress.com")
As you can see, ChromeOptions have '--proxy-auth=yjd5Rn:29apJZ' argument.
Could anyone tell me how to use proxy and provide authorization to proxy server in Firefox with Selenium and in python? Thanks in advance!
Below is the login page from the proxy server:

Selenium Python can't connect to website with proxy

I'm trying to use Selenium with chrome driver and connect to websites using proxy, but for some odd reason chrome gives back an error, that either connection was reset or connection timed out or this site cant be reached and so on.. used many proxies, so I doubt that the proxy server is at fault.
Here's my code:
from selenium import webdriver
chromedriver = r'C:/Users\seife\Documents\chromedriver\chromedriver.exe'
PROXY = "177.202.59.58:8080"
chrome_options = webdriver.ChromeOptions()
chrome_options.add_argument('--proxy-server=%s' % PROXY)
chrome = webdriver.Chrome(chromedriver, options=chrome_options)
chrome.get("http://whatismyipaddress.com")
Here's how the page looks:

#you need to import Options
from selenium.webdriver.chrome.options import Options
from selenium import webdriver
chromedriver = r'C:/Users\seife\Documents\chromedriver\chromedriver.exe'
PROXY = "177.202.59.58:8080" #free proxies sometimes don't work, I tried with netherland's proxy, and it worked
chrome_options = Options() #here is the change
chrome_options.add_argument('--proxy-server=%s' % PROXY)
chrome = webdriver.Chrome(chromedriver, options=chrome_options)
chrome.get("https://whatismyipaddress.com") #and here is the change, just https

How to use only Socks Proxy in Firefox using Selenium?

i'm writing tests in selenium and tried to use only socks for proxy. Here is the code.
from selenium import webdriver
proxy = "localhost"
port = "5900"
profile = webdriver.FirefoxProfile()
profile.set_preference("network.proxy.type", 1)
profile.set_preference("network.proxy.socks", proxy)
profile.set_preference("network.proxy.socks_port", port)
profile.update_preferences()
driver = webdriver.Firefox(executable_path="C:\Program Files\MozillaFirefox\geckodriver\geckodriver.exe", firefox_profile=profile)
driver.get("https://[xxx:xxx:xxx:xxx]")
But when I checked in Firefox. the proxy is set for all HTTP, FTP, etc instead of only Socks. Here is the image
Example
I know I am missing something Basic here. What is it?

profile.set_preference("network.proxy.socks_port", int(port))

Switch proxy without closing webdriver python selenium

Is there a way to change the proxy ip address for your Selenium Chrome web driver without closing the browser and just by reloading?
I know that you can add a proxy by running this but how can you change it?:
from selenium import webdriver
PROXY = "23.23.23.23:3128" # IP:PORT or HOST:PORT
chrome_options = webdriver.ChromeOptions()
chrome_options.add_argument('--proxy-server=%s' % PROXY)
chrome = webdriver.Chrome(options=chrome_options)

How do you run headless chrome and a proxy using selenium in python?

My python script has the headless chrome in selenium up and functional but how, if possible, can I use a proxy as well? How can I pass the proxy host port to my headless chrome browser?
options = webdriver.ChromeOptions()
options.add_argument('headless')
browser = webdriver.Chrome(chrome_options=options)
How do I use the proxy host port with selenium and mainly headless chrome? Thanks!

Something like this:
from selenium import webdriver
from selenium.webdriver.common.proxy import Proxy, ProxyType
options = webdriver.ChromeOptions()
options.add_argument('headless')
desired_caps = options.to_capabilities()
prox = Proxy()
prox.proxy_type = ProxyType.MANUAL
prox.http_proxy = "ip_addr:port"
prox.socks_proxy = "ip_addr:port"
prox.ssl_proxy = "ip_addr:port"
prox.add_to_capabilities(desired_caps)
browser = webdriver.Chrome(desired_capabilities=desired_caps)

The simplest way to do is something like below. Put any ip address in the proxy variable to find out how it works. ip and port are separated by :.
from selenium import webdriver
proxy = "94.122.251.105:3128" #test with any ip address which supports `http` as well because the link within the script are of `http`
chrome_options = webdriver.ChromeOptions()
chrome_options.add_argument('--headless')
chrome_options.add_argument('--proxy-server={}'.format(proxy))
driver = webdriver.Chrome(chrome_options=chrome_options)
driver.get('http://www.lagado.com/proxy-test')
items = driver.find_element_by_css_selector(".main-panel p:nth-of-type(2)").text
print(items) #it should print out the ip address you are using in the `proxy` variable above
driver.quit()