The Opera browser comes with an integrated pop-up blocker, which prevents Web pages from opening new windows -- such as advertisements -- on top of or behind the current page. In addition to disabling or enabling the pop-up blocker by editing the browser's settings, Opera lets you create pop-up rules that apply to a specific website.
Enabling or Disabling the Pop-Up Blocker
Open the Opera menu and select Settings.
Click Websites in the sidebar and scroll down to the Pop-Ups section. Select Allow all sites to show pop-ups to disable the pop-up blocker or Do not allow any site to show pop-ups to turn it off.
Creating a Pop-Up Rule
While pop-ups are generally a nuisance, some websites display valuable information in pop-up windows, such as a login form or download instructions. Create a pop-up rule -- also known as an exception -- to either allow or disallow pop-ups on a specific site, regardless of whether you enabled the blocker.
Open the Opera menu, select Settings and click Websites in the sidebar. Click the Manage Exceptions button under Pop-ups.
Enter the domain name of the website in the Hostname pattern field.
Do not add a prefix -- or subdomain -- to the address unless you want to allow or block pop-ups on specific sections of the website. For example, typing www.example.com in the Hostname pattern field would block or allow pop-ups on a page located at http://www.example.com/contact.html, but not on one located at http://blog.example.com/aboutus.html.
Select either Allow or Block from the Behavior drop-down menu and click Done to save the exception.
Viewing Pop-Ups Blocked by Opera
If Opera blocked a pop-up window that contains important information, manually open that pop-up window by clicking the warning message the browser displays in the address bar.
Click the Pop-Up Blocked box in the address bar to open a contextual menu.
The Pop-Up Blocked warning box -- and therefore the ability to re-open a blocked pop-up -- goes away once you navigate to a new page.
Select a blocked pop-up from the list to manually open that pop-up window.
Clicking Always Allow Pop-Ups from in the contextual menu lets you add a new exception to Opera's pop-up blocker.