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"This is the initial start page for the WebDriver server" - Unable to resolve in Selenium/Python program using IE 11

After running my Selenium/Python program, browser opened with below message:
This is the initial start page for the WebDriver server
I have done below steps to resolve this:
In IE Options -> Security tab, Enable Protected Mode check box is ticked OFF in all zones: Internet,
Local Intranet, Trusted sites and Restricted sites. Also, in Advanced tab -> Security, ticked OFF the
check box: "Enable Enhanced Protected Mode" (Also, I tried with enabling this Protected Mode in all
zones and in Advanced tab too).
My IEdriver (version 3.1.4) and Selenium web driver (version 3.1.4) are compatible (both are on same
version)
I tried above two, still I am getting the same message.
I have added below content to ignore Protected mode:
caps = DesiredCapabilities.INTERNETEXPLORER
caps['ignoreProtectedModeSettings'] = True
driver = webdriver.Ie(executable_path='C:/Selenium/Drivers/IEDriverServer.exe',capabilities=caps)
Still, I am getting the same message after adding above code.
Any ideas? Please help.

This is as per design. When IEDriverServer.exe opens a new a new Browsing Context i.e. Internet Explorer browsing session it navigates first to this page.
Browser Snapshot
Once you initialize the browser through the line:
driver = webdriver.Ie(executable_path='C:/Selenium/Drivers/IEDriverServer.exe',capabilities=caps)
next you can invoke the get() command to access any url. As an example:
driver.get('https://www.google.com/')
Additional Consideration
Additionally you need to:
Upgrade Selenium to current levels Version 3.141.59.
Upgrade IEDriverServer to latest IEDriverServer v3.150.1 level.
Note: As per best practices as Selenium Client and InternetExplorerDriver are released in sync and you must try to use both the binaries from the same major release.
Clean your Project Workspace through your IDE and Rebuild your project with required dependencies only.
Execute your #Test.
Always invoke driver.quit() within tearDown(){} method to close & destroy the WebDriver and Web Client instances gracefully.

Open URL in Python in existing tab

I'm using webcommands to control a Sonoff. To change the setting I run the following line in Python:
webbrowser.open('http://Sonoff_IP/cm?cmnd=POWER%20TOGGLE')
I am looking for a way to run the URL in the same tab, so as not to create a new tab every time the command runs.

My understanding is that using if you are using webbrowser.open(<url>) it's not possible to avoid getting a new tab each time; with webbrowser it is possible to make sure it opens in the same browser window, but not in the same tab. To target the same window you need to set new=0 like:
webbrowser.open('http://Sonoff_IP/cm?cmnd=POWER%20TOGGLE', 0);
However, if you are able to open the link using the selenium library instead it is possible.
Read the docs for selenium and webdriver here: https://selenium-python.readthedocs.io/api.html
The main issue with doing it using Selenium is that, I think, you lose the ability to target the user's default web browser, and by default Selenium seems to default to Firefox since a lightweight port of Firefox is included in the Selenium library itself.
An example of opening a link in Selenium would be like:
from selenium import webdriver
link1="https://www.google.com"
link2="https://www.youtube.com/"
driver=webdriver.Firefox()
driver.get(link1)
driver.get(link2)
Selenium does support a lot of different browsers, so if you are able to get the user's default web browser from the webbrowser module or by some other method, you would be able to use that information to open URLs in the same tab with the user's default browser.
Hope this helps and good luck! :)

Use Javascript:
OpenSameTab = '<script language="JavaScript" type="text/JavaScript">window.location = \'%s\';</script>'
and then
print OpenSameTab % 'file.py'

How can I get rid of the message "This connection is not secure..."?

I have an automated test which fills the User + Password fields and click a certain button to Login.
During the development session I managed to run this automation tens of times without any problem. Suddenly today I found out that the response to the automated test has changed and now I can't Login. I can say that the WEB under test didn't change. I can almost tell for sure that the FireFox that is run by the automated test has updated without my control (the browser that the automated test runs has an up-to-date version 54 while the browser that I run has a version 52).
I have tried to configure the Version 54 so that he won't pop-up the message (through the about:config) but my settings are not saved.
First of all I would like to know how can I manage to get rid of the pop-up message ?
Second thing I would like to know how can I prevent the updates of the browser version ?
Could it be that the geckodriver has its own FireFox settings and Version ?

Firstly, you can configure FirefoxProfile to accept untrusted connections, as shown below:
from selenium import webdriver
profile = webdriver.FirefoxProfile()
profile.accept_untrusted_certs = True
driver = webdriver.Firefox(firefox_profile=profile)
This answer contains configuration details about other browsers as well.
Secondly, in order to disable automatic updates for Firefox browser, you can follow following steps:
Launch Firefox and go to 'Tools->Options->Advanced'.
Click on 'Updates' tab.
Click on 'Never Check for updates' option button under 'Firefox updates' section.
Restart Firefox.
Let me know, if it resolves your issue.

You need to set acceptInsecureCerts to true in your capabilities.
DesiredCapabilities capabilities = DesiredCapabilities.firefox();
capabilities.setCapability(FirefoxDriver.MARIONETTE, true);
capabilities.setCapability(CapabilityType.ACCEPT_INSECURE_CERTS, true);
WebDriver webDriver = new FirefoxDriver(capabilities);
Edit: Sorry about the java code. The thing is you need set that capability.

Auto saved password is not working when a URL is open through python script

I wrote a code in which multiple URL is opening in Mozilla browser. But all URL have required login details. To avoid login code in my script, I used 'Saved Password' tactics. Before running to script I opened all URL and fill credential and marked as saved password. Assuming when I will run script then It would not ask any login. Unfortunately this is not working. When I am running script then login is required at that time too.
Please suggest where I am missing.

Every time a selenium-powered browser is fired up - it starts with a complete clean session by default. What you save and configure in your actual browser manually would not automagically be applied there.
What you need to do is to let your driver know that you want to use an existing profile via FirefoxProfile. Here is a great HOWTO.
In short: locate the existing profile directory and point your FirefoxProfile instance to it:
profile = webdriver.FirefoxProfile('/path/to/profile/directory')
driver = webdriver.Firefox(profile)

Click Chrome prompt box to save password

I've just started using Selenium and implemented the ChromeDriver, but when going to the page I want, chrome gives it own prompt box, similar to " save password for this site always", it pretty much has the site asking to store data on my pc, and I have to verify that.. but it interferes with my script.
Is there anyway for Selenium to click " OK "? or am I able to import some sort of session ID so it's already allowed permission to save files rather than prompt me everytime?

First, I don't think this can interfere with the tests in any way, because it's a browser level thing. " it pretty much has the site asking to store data on my pc, and I have to verify that.", wrong. It has nothing to do with "save files". You don't need to worry about this prompt at all.
Second, I somehow can't reproduce your issue, so I can only provide the logic as below.
Chrome has a switch called "--enable-save-password-bubble", which enables save password prompt bubble. You can try set it to false when starting your Chrome.
# untested code, only the logic
from selenium import webdriver
from selenium.webdriver.chrome.options import Options
chrome_options = Options()
chrome_options.add_argument("--enable-save-password-bubble=false")
driver = webdriver.Chrome(executable_path="path/to/chromedriver", chrome_options=chrome_options)