Question

I created an extension for Google Chrome with this background script background.js:

chrome.browserAction.onClicked.addListener(function(tab) {
  chrome.tabs.executeScript(tab.id, {code:"document.body.style.background='red !important';"}); // doesn't work
  chrome.tabs.executeScript(tab.id, {code:"alert('hello');"}); // runs alert
});

I want to run document.body.style.background='red !important'; in the context of the web page.
How can I do it?

manifest.json:

{
  "name": "Test",
  "version": "1.0",
  "manifest_version": 2,
  "description": "Test",
  "browser_action": { "default_icon": "icon.png" },
  "background": { "scripts": ["background.js"] },
  "permissions": ["tabs", "*://*/*"]
}

Answer 1

Plain and straight. Add https://*/* to permissions.