You can always do this (requires host permission or activeTab):
chrome.browserAction.onClicked.addListener(function(tab) {
chrome.tabs.executeScript(tab.id, {
code: "window.stop();",
runAt: "document_start"
});
});
, . , , run_at, document_start, ; executeScript, , script, :
if(contentInjected) return;
var contentInjected = true;