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Clicking reCaptchas in JavaScript

I am working on a project, and it involves me clicking a reCaptcha element (iframe) in JavaScript. I have found multiple ways to detect if there is a reCaptcha element (".g-recaptcha", role='presentation' on the iframe itself, etc) however upon trying to click it I get console errors. Note that right now I am just executing the code in the web console, and have not actually programmed it into an extension. Basically, the command I am trying to run the console is :
document.querySelector('[role="presentation"]').contentWindow.document.getElementById("recaptcha-anchor").click()
The reason this "should" work is because the iframe element has the unique attribute of "role=presentation", it then goes into the html code embedded in the iframe and tries to click the little box, as noted by "recaptcha-anchor". However, testing this code grants me the following error:
VM8195:1 Uncaught DOMException: Blocked a frame with origin "https://minecraft.buzz" from accessing a cross-origin frame.
at <anonymous>:1:62
(anonymous) # VM8195:1
Does someone have any ways to get around this, or potentially know how I could code something in a JS chrome extension to do this?

How do you use a URL javascript injection to create an iframe on any specified website?

I've looked for answers to this question, but the closest that I could find all had to do with using javascript to create an iframe on a user-owned page. I specifically want to inject javascript into a website via the URL in order to add a frame to Google at the bottom of that website. The syntax which I have been using is as follows:
Javascript: var ifr=document.createElement('iframe');ifr.setAttribute("src","www.Google.com");ifr.width=100+'%';ifr.height=500+'px';document.body.appendChild(ifr); void(0);
Unfortunately, every time that I submit this, the iframe throws a 500 internal server error. Can anybody lend advice as to why this may be happening?

Can I get the address bar url from the javascript console when the page has failed to load?

Just say I typed in a bad hostname in the address bar.
For example, say I wasn't running a local web server, and I load:
http://localhost/callback_url
In Chrome, this will give me a "This webpage is not available" message.
Is there anyway I can find out what the url is in the address bar from the Javascript console, even though the page failed to load?
I know I can normally use window.location.href to get this, but that returns "data:text/html,chromewebdata" in this instance.
So in this example, I'd like to know if there's some javascript that returns http://localohost/callback_url
EDIT: The main reason I'd like to do this is so I know if server side redirect failed when using ChromeDriver with Selenium. So I'd prefer to avoid using extensions if possible, and am open to Chrome and ChromeDriver specific solutions if applicable! The callback_url may have extra info in it, added by the server, and I'd like to see what this info is. I'd like to avoid running another server to get this data if possible.

The loadTimeData object included in the ERR_CONNECTION_REFUSED page has the failed URL:
> loadTimeData.data_.summary.failedUrl
"http://localhost/foo?request_url=bar"

You can get it from the title of the page.
By typing document.title and doing some regex you can get the URL.
Another way I found is by using the following
var data = loadTimeData.createJsEvalContext();
console.log(data.a.$top.summary.failedUrl);
If you open the developer tools and search for a part of the URL in source code, you will see that Chrome creates the loadTimeData in the "not available page".

trying to use window.opener technique to call parent js function from child popup window?

I'm trying to use the js window.opener technique to return a selected value from a child window back to a parent js function. Here's a url to a zip file where I set up a basic poc:
https://www.dropbox.com/s/gle9sou3gj770ej/WindowOpenerPOC.zip
LaunchPage.html is used to open ResolveCaseDialog.html. The Submit button on ResolveCaseDialog submits the selected "Resolution Type" value to window.opener.ProcessReturnValue().
However, when I click the Submit button, the ResolveCaseDialog js throws the following exception: "Uncaught SecurityError: Blocked a frame with origin "null" from accessing a frame with origin "null". Protocols, domains, and ports must match."
Can you please take a look at this setup and let me know if there's a trick to making this work that I'm missing?

I'm on a similar problem too, you have to use
opener.ProcessReturnValue();
instead of
window.opener.ProcessReturnValue()
This works for Internet Explorer but doesen't work on Chrome.
Now the problem is that is not specified the port.
We are a step forward but the problem isn't resolved yet.
Here there is an example:
call opener function
The main page is testA, that calls testB.

Javascript message within iframe

I have this error while running a html file in Chrome:
iframe Unsafe JavaScript attempt to access frame with URL http‍://my_server.com/param from frame with URL http‍://another_server/example.html. Domains, protocols and ports must match.
Is there a way so I can run the Javascript in different server?

You need to change the hash not the url itself. There are many similar questions in stackoverflow regarding this issue. You can try check this out.