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Selenium ChromeDriver - Run in background but not headless

I am looking for a way to run selenium tests with a chrome driver, in the background. With the background I mean as in, not the foreground focussed window. I can actually do this, but as soon as actions like opening a new tab or switching between windows (so basically switching window handles) happen in the chrome driver, the browser window gets pushed to the foreground.
So my question is, how can I prevent this from happening without running the test headless?
Any suggestions are appreciated, open for discussion.
EDIT
As a somewhat temporary solution I came up with the following.
Using the Windows 10 Virtual Desktops feature, I run the test and thus the chrome browser window in a seperate virual desktop.
I then switch back to my main virtual desktop to continue with other tasks.
This prevents the chrome browser window from being forced to the foreground.
Note that this still makes a flashing chrome icon appear in the taskbar when any of the actions described above appear.
Still looking for a more solid solution, so any suggestions are still appreaciated.
To hopefully open new perspectives and discussion points, and ultimately a solution, I will provide some more detailed info of what my code is doing.
I have 5 chrome webdrivers, and each of these webdrivers contains 6 tabs (WindowHandles).
The idea is that a certain process has to be repeated continuously on each tab. So we loop over each webdriver, and within that webdriver over each tab and set this tab as the webdrivers current WindowHandle. This makes the chrome window visibly switch to the assigned tab.
After that switch has taken place, so basic selenium automation is performed on the content of the tab, after wich we repeat the whole process.
The actual issue seems to take place when a chrome webdriver switches to a new tab (WindowHandle), at this moment the chrome window containing the tab is pushed to the foreground and steals focus. Note that this does not always takes place, often it can switch tabs without any issues. So it is unclear wether there is another factor which would cause the window to steal focus.
EDIT 2
After doing the following:
I overloaded the selenium method which is used to switch between tabs (WindowHandles), and called SetWindoPos each time. Unfortunately this did not solve this issue either. I will try to look deeper into what might be causing this and will report back. – S. Van den Wyngaert
I went out for a few hours while running the tests, and came back to see that surprisingly I was still on my main Virtual Desktop (win10 feature). This means that the issue didn't occur during the time I was gone. I started working again, opened a chrome window and noticed that shortly after I did this, focus was stolen by one of the chrome driver's windows again.
What I conclude from this is that the issue only occurs when another chrome window (not opened by a chrome driver from code) is opened.
I will keep investigating and will report back with updates.
After investigating this behavior for a few more hours I noticed that when another chrome window is open, as long as this has focus, the issue doesn't take place. So to quickly summarize this:
The issue doesn't take place when:
No other chrome windows (not selenium driven) are opened or minimised
Another chrome window (not selenium driven) is opened and has focus
Another application running fullscreen mode has focus
The issue does take place when:
Another chrome window (not selenium driven) is opened and has no focus
Note that when I talk about another chrome window I specificly mean a chrome window that is not driven by selenium, so a regular chrome window opened by the user.

Easiest way would be to run a local selenium grid. Start your node(s) as a windows service. This way the test will run in the background, without being headless.

Another good option to scale your solution, and if your machine has the capacity to run docker, is to use
zalenium
It's a docker based, auto scaling, selenium-grid solution that works pretty quick out of the box.
You can watch your tests live via the management pages, watch a recording after the fact, pause/debug with live interaction via VNC. Also something to be said for not having the worry about changing browser versions.
Last time i used it, it had the odd bug and throws an end of stream error every now and then - but that was a good year ago.

Disable Taskbar in Windows 10

Is there any way to completely disable the taskbar in Windows 10 Home? I have a C# app that I want to display fullscreen on clients' displays without any sign of it running on Windows. It's supposed to run on startup and display a website.
I created a setup that changes most of the Windows settings via registry, like hiding desktop icons and altering logon view, but the taskbar remains visible. Auto hide doesn't satisfy me, because after the system boots the taskbar is still visible until you actually click somewhere on the desktop, and it takes a while for my app to run. I'd really appreciate some help.

When explorer is running, there taskbar will always be visible in some kind (even if it's a small border).
If you want to achieve something like a digital signage solution, you may replace the shell. Changing the shell will also provide some other benefits (most popups / balloontips won't occur anymore).
Be aware that this configuration is effective for all users on the system.
Path to the shell is available at
HKEY_LOCAL_MACHINE\Software\Microsoft\Windows NT\CurrentVersion\WinLogon\Shell
Update:
Just to hightlight:
It is indeed possible to have custom shells per user (see comments).
This is done by specifying a custom location of the shell path that is located in the registry for a given user.

Yes, you can totally disable the taskbar in Windows 10 but it is only temporary until you hover your mouse around the taskbar area.
Here's a tutorial: how to hide the taskbar in Windows 10

IE full Screen mode using selenium Webdriver

I want to check if Internet Explorer window is in fullscreen mode or not?
I use driver.Manage().Window.Maximize();
It maximizes window only but does not switched to FullScreen view.
Is there any method?

Selenium web driver do not have the API to achieve the Full screen as per your post. But you can achieve it through send keys method of windows. Try below code.
System.Windows.Forms.SendKeys.SendWait("{F11}");

#Sham: that is a unique way to do it... I would recommend this:
driver.Manage().Window().Maximize(); after window braces should be added

Run firefox in background from C#

I run Firefox (default browser) from C# with the code:
System.Diagnostics.Process.Start(browser.Document.Url.ToString());
I want Firefox to run in the background, because every time is open a new tab, the Windows is focusing on the Firefox, and is annoying.
How can I control Firefox tabs, close them after a time ?

You can use a ProcessStartInfo to tell it to run hidden or minimized or whatever. Not sure how to programmatically manipulate FireFox but I'm sure there's an API.
var psi = new System.Diagnostics.ProcessStartInfo();
psi.WindowStyle = System.Diagnostics.ProcessWindowStyle.Hidden;
psi.FileName = browser.Document.Url.ToString();
var proc = System.Diagnostics.Process.Start(psi);
//after a while...
proc.Kill();

Technically, you are not starting Firefox, you are executing a url.
I'm not sure exactly what Windows does, but in effect, that url is opened in the system's default browser, be it IE, FF or some other thing that might not even support tabs, so finding and killing Firefox is not really a solution if the url is opened in Opera.
Moreover, the Process.Start method returns null if no process is actually started by the call, so if Firefox is already running and just displays an additional tab, you will get a null as the result of the call.
So, I'm pretty sure this is impossible to do in a broad sence (any browser), and, unless Firefox has some sort of API for client-side management, not possible for that scenario either.
BTW, on my system (IE is the default browser), the WindowStyle property is not working as expected, as IE pops up to the front.

Rather than trimming the tabs, why not just kill the entire Firefox process and restart it periodically?

You won't be able to do this. First of all, I'm pretty sure running Firefox in the background won't stop it gaining focus when a new tab is opened. Second, it is difficult to control firefox programmatically. The only way to do what you want is to use a plugin like MozRepl. You could also try using selenium or your own JavaScript to control the browser behaviour. I needed to be able to open and close tabs in a shell script without using selenium or MozRepl, check out my question From a shell script open a new tab in a specific instance of Firefox

Reset Taskbar Flash in C#

I have an application where the taskbar flashes if an event has occurred. This is working perfectly, and was relatively easy to implement using a Win32 API described below:
http://blogs.x2line.com/al/archive/2008/04/19/3392.aspx
However, when I stop the flashing, sometimes the application is stuck in the "highlighted" state in the taskbar. This only gets reset by clicking on the application in the taskbar, minimizing it, then re-maximizing it. Is there a way to clear this from being highlighted without any user interaction?

Maybe instead of flashing it you could put an overlay icon on it - one line of code from C# with the Code Pack. Then when you want to clear it you could take the overlay icon away - again one line of code. Windows 7 only, however.

Can you post the code that you are using to "Stop" the flashing?
Have you also considered using a different flag such as:
// flash until the window comes to the foreground
FLASHW_TIMERNOFG = 12;
You will still need to click on the applicaiton to get the flash to stop, but you should not have to minimize then re-maximize the app to get the flash to stop.

You can include the FlashTaskbar snippet and use the following code
FlashWindow(Form.Handle, FlashMode.FLASHW_STOP)