Content scripts, by definition, are part of external regular web pages you load so I'm not really sure how your script could work on a "regular web page" but not the content script. Do you mean the code works when you embed it in your own pages, but not in other pages via the content script?
Per the cross-post here, the issue is indeed that the opened window is given a unique origin. This was intentional as the members of the standards working group (SWG) felt that it would be more secure to not make an exception for about:blank pages where they inherit the sandbox's origin.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.