Chrome Extension - permissions for executing code on new tab

I have following code for opening new tab with defined URL 开发者_如何学Cand then execute some piece of code on it:

chrome.tabs.create({
        'url': 'https://myownServer.com',
        'selected': false
    }, function(tab) {
        chrome.tabs.executeScript(tab.id, {
            'file': 'myCode.js'
        });
    });

The tab openes, but when it comes to execute the file (myCode.js), it log to console this error:

Uncaught Error: You do not have permission to use 'tabs.executeScript'.
Be sure to declare in your manifest what permissions you need.

I have not found any permission like this (except 'tabs', which i'm already having in my manifest.json). What should I do to make it work?

You need to declare host permissions that would allow you to inject content scripts on qualified domains:

"permissions": [
  "tabs", "https://myownServer.com/*"
],

more about it here and here.