Append Caroufredsel js file to the <head> - caroufredsel

According to the Caroufredsel specification the caroufredsel needs to be included in the head of a page. Problem being is that I can't access the head of a page as I have to integrate the code in a content slot of a platform. Is there a way around this so I can either dynamically add the script to the because the caroufredsel doesn't load for me if I include it directly in the content slot.
Thanks!

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I'm working on a Chrome extension that among other things supports a page with multiple dynamically created iframes in it, pointing to multiple different domains. I need to load a content script into each of those iframes, ideally without loading it into every page.
There's a separate content script that's running on all those iframe pages, which can detect that it's in an applicable iframe, and I'd like it to load this other content script. After some wrangling, it can get the frameId of that iframe, but chrome.tabs.executeScript() takes only tabId, not frameId, so the script loads in the top-level page, not the desired iframe.
Note that the script I want to inject needs to run as a content script, with access to the available Chrome APIs.
Is it possible to do this? How?
Update: Ach, you're of course right wOxxOm, that "frameId can be specified inside executeScript's second parameter". Thank you again, make that an answer and I'll accept it. I need to read more carefully, apparently. I'm a long-time programmer, but new to Chrome extensions, there's a lot to absorb.
Secondary question: It appears that I need to add <all_urls> or http://*/* and https://*/*, permission to the manifest for this to be allowed. The main content_script that's doing this has similar match patterns, and I could add this secondary script there too, but it's actually only needed for pages shown in these iframes, so this seems better to me. Are there other downsides to doing it this way, or is there some better approach, other than xhr/eval?

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How can I make a handler deliver HTML (using hamlet), whithout wrapping it inside defaultLayout?? They will have as root a div tag, not something inside a whole html tag. Such way should also consider internationalization.
Using Angular with Yesod works well because angular templating happens inside valid html that hamlet can generate.
Besides the current comment answer you might consider including a lot of templates using script tags inside a layout. I have done this before where there was a front page layout, an app layout, and an admin layout.

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More details here:
https://segment.com/docs/libraries/analytics.js/quickstart/

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And document.loadOverlay() does allow me to specify a 'remote' URL for the overlay.
Is the same possible in Chrome?
I've been playing with chrome.browserAction.setPopup( details ) API, but it seems that the details.popup param must specify a local file, and not a remote URL.
I have answered this exact same question on the Chromium-Extensions mailinglist.
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Use an iframe + extension messaging within the popup. The iframe
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Hope this helped!

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