Properly using NotScripts in Chrome would likely of prevented that popup from displaying.
NotScripts - Chrome Web Store
Adblock Plus is another add-on I would recommend for Chrome. Adblock Plus - Chrome Web Store
There may be something else lurking in your Chrome that caused the popup. Suggest you do this:
Resetting your browser settings will reset the unwanted changes caused by installing other programs. However, your saved bookmarks and passwords will not be cleared or changed.
Reset your browser settings:
- Click the Chrome menu on the browser toolbar.
- Select Settings.
- Click Show advanced settings and find the "Reset browser settings” section.
- Click Reset browser settings.
- In the dialog that appears, click Reset. Note: When the "Help make Google Chrome better by reporting the current settings" checkbox is selected you are anonymously sending Google your Chrome settings. Reporting these settings allows us to analyze trends and work to prevent future unwanted settings changes.