When it comes to add-ons, the NoScript add-on for the Firefox web browser is my favorite one. It blocks script from running on domains until I allow them to run. NoScript offers more functionality than that like XSS protection and other security-related features that make it the best security add-on there is.
I have reviewed the Google Chrome extension NotScript in the past which offers a somewhat limited NoScript experience for that browser. And Swapnil (thanks) just informed me that Opera too has a NotScript extension available.
NotScripts is available for Opera 11.10 up to Opera 12.x but not the recent Chromium version of the browser.
The installation process is a bit on the complicated side. Here are the instructions on how to install NotScripts correctly.
Opera's Notscript, unlike NoScript comes with three different script blocking modes. The default mode is whitelist which blocks all scripts except those that are run from whitelisted domains.
Blacklist, the second mode allows all scripts by default and blocks only scripts on a user maintained blacklist (much like the Firefox add-on YesScript).
The last mode Whitelist + Same Origin uses the whitelist approach to block all scripts but allows scripts running on the domain that is loaded in the browser. So, if you would open ghacks.net scripts that originate from the site would be allowed but scripts from any other site would not be.
So more choice in this regard which is really nice. When you visit a site you need to click on the NotScript icon to display the list of blocked scripts. There is no indicator that scripts are blocked which is probably the biggest usability issue. A click on the icon displays the scripts with options to allow, block or temporarily allow them individually.
If you run blacklist mode (allow all scripts except selected ones) then you see a script listing similar to that on the screenshot above. The blue action is the current one for a script on that particular site. Just like with NoScript, you can allow all scripts, globally allow all temporarily until revoked, or temporarily allow the shown scripts.
NotScript seems to work considerably well. I have two big gripes with it. First the missing notification as it is a guess game if a script has been blocked or not, and second that the developer has not updated the script in a while (the last update dates back to April 2011).
The extension itself works and that's the most important aspect obviously. It is not a 100% port of NoScript but a port that brings the most important feature of the Firefox security extension to Opera. For that, it is highly recommended to be installed.
An alternative to that is the Opera NoScript Alternative BlockIt which I have reviewed in the linked article. It is also only available for classic Opera.
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