I've found a quick solution:
I have a content scripts that, on load, posts a message to the
background page.
This message is sent for each single iframe on the page.
This is the code on the content script:
chrome.extension.connect().postMessage({ location:location });
On the background page, there is the following code. (The last "if"
checks that the page address is the same of the tab)
chrome.extension.onConnect.addListener(function(port) {
port.onMessage.addListener(function(i) {
if (i.code) {
if ( i.location.href == port.tab.url ) {
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