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Executing code to an other window through window.open()

I making this bot in JavaScript in the chrome console. And one of the lines in my script is window.open('thewebsite','_self') so it opens a different website in the same window. However I cant seem to execute code on that new website that I opened with window.open(). For example I want to do document.getElementById().click() however its not clicking on the new website I made.
For example:
If I was on google.com the script would open googleimages. But I want the next line of code for example typing in the search bar to happen on google images.

window.open refreshes console, so you can't execute any code after.
You could try to get target url content and replace first page content, but you'll be blocked with Access-Control-Allow-Origin
What you're trying to achieve is indeed a macro. You should take a look at iMacros and see how they chain instructions from page to page.

How do I make all elements of a webpage appear in the source?

When I press "view-source" (in chrome) of certain webpages, I get some thinned-version of an html, opposed to the more rich version I get when I press "inspect".
I think some content (maybe the scripts) are hidden when you view the source code, and all you get is the script code and not what it translates into.
Is there a way to get the more rich version as an html? (And obviously - if there is - how do you get it?)
Either for download manually, or for when you open a url to read in some program (python urlopen, for example)

What "Show Source" does is give you the actual raw original source file that the browser received from the server. What you see in your browser and what the Element Inspector shows you is the current state of the DOM, these days often heavily modified at runtime by Javascript.
source = what the page started with
current DOM = what the page looks like now after dynamic modification
Nothing is being "thinned".
I don't know about your browser, but mine allows me to copy the current DOM as HTML, I just need to select the topmost element:

Javascript redirecting on everypage can't remove

I have a javascript file that was accidentally added to the admin side of our site. The javascript is below,
<script>
if (document.getElementById("errorTitle") != null && document.getElementById("errorTitle").innerHTML === "Insufficient Privileges") {
window.location.replace("/portal/InsufficientPrivileges");
} else {
window.location.replace("/portal/FileNotFound");
}
</script>
The problem is that this code runs on the admin pages so we are unable to remove it. If we disable javascript on the browser the page never renders, dynamic content. How can we disable this from running so we can upload the proper file?

You might be able to edit the page that contains the reference to the problem file. If you can just edit the page to jump over where that code is called with an if statement or goto.
If you can't edit the other pages then you can Use the debugger to change the code executed on the fly. Chrome and Firefox have debuggers that should be able to do this.
Specifically for Chrome you go into the object inspector (available via menus or right clicking on the page). Then you can see the HTML on the left window. You select the script tag of interest, you can right click and select delete or select "Edit HTML"

If the page redirects you before you're even able to edit anything, you can use automated tools.
Fiddler (Windows)
Fiddler lets you see all pages downloaded, and then you can have it send your browser a different page when it tries downloading any page you specify (AutoResponder feature). This way you can temporarily edit a page while you can fix it in the admin panel.
Greasemonkey (Firefox) or Tampermonkey (Chrome)
These plugins let you run JavaScript code on a page as soon as it gets to your browser. This will let you do things such as removing the script tag programmatically.

preventing external page from redirecting MY (parent) page

Using the latest version of Chrome on Mac OS 10.7.
I assume it is some clever javascript that is enabling the folks at this webpage:
http://www.chairworks.com/
...to close my (the parent) page which opened their (chairworks.com) page in the first place.
I did not open them with javascript, but with an <a> tag with the target="_blank" attribute.
If I disable javascript, then the behavior stops.
www.chairworks.com
I would expect the page at chairworks.com/ to simply open in another tab/window... but what I find is that as soon as the new browser tab opens, it closes, and then my page (the parent tab/window) gets redirected to the chairworks.com page.
Kinda rude.
Can someone point me to what code enables them to do that? And how do I prevent it? (Assuming I want a link to behave as expected, such as in my demo page.)

I believe the proper thing to do is set corresponding link type attribute so the browser doesn't provide the target window with and opener reference.
Link
You can read more about link types here: https://developer.mozilla.org/en-US/docs/Web/HTML/Link_types

This is the script they are using:
setTimeout('redirect_page()',0);
function redirect_page(){if (window.opener) { window.opener.location.href = '/home.html'; window.close(); } else { location.href = '/home.html'; }}
As to how to circumvent it (just an idea):
Create your own blank page, with it's source set to about:blank. When it loads (or after a time-out) you could write some code to that window that will then open the offending link.
Then the offending link just closes your buffer-page. F*ck 'm!! Power to the user!
Edit: looks like you could also name your page home.html hehe, but that is not such a workable solution..
Final Edit: SIMPLE LOGIC people...
www.chairworks.com
works for everyone, no javascript needed.
See this working jsfiddle example.

As #GitaarLAB explained, the targeted website is using the window.opener property to get access to your page. Using some Javascript yourself, and an about:blank page in the middle, can help you cut their access to your page. It would be like:
http://www.chairworks.com/
Some notes:
I'm leaving the href property there for users without JS enabled (guess what! the targeted website won't have JS neither! ;), or the web crawlers like search engines' (only those who don't care about JS stuff, though)
Before redirecting to the targeted website, you cut the back-link by resetting the window.opener attribute of the new window.
And after opening the targeted website, there's a return false; to prevent the normal the browser to use the href and target attributes.

Javascript HTML Window Print Issue

I am using window.print() Javascript function for my HTML page to print, but it inclues Page URL and date in footer by default into the print or print preview.
Any quick solution, might be some patch in JS or something?

You can't remove the headers/footers programmatically. Visit this link or this SO question