&gt; It&#x27;s trivial (one setting toggle) to disable Javascript in both Chrome and Safari (and I presume Firefox too).<p>Only globally it is trivial, but locally per web site, even in the same tab, certainly not:<p>You know, one single page can fetch the scripts from different addresses. Opera allowed me to run the script from site A but not from site B while opening the page on site C, from which the script is also not run.<p>The effect is that you can enable, for example, some real functionality on some site but even if some annoying trackers or ad are included they are never executed. And it&#x27;s not about being ad-hostile, it&#x27;s about me as a user selecting which sites I want to ever let run dynamic content and consuming other sites as the static content. Breaks post on Google&#x27;s &quot;blogger&quot; but the rest of the web is mostly better, faster and much safer.<p>Only if you never even thought about that, and especially if you&#x27;ve never considered what you would have to do if you would write such an extension can you even argument with the &quot;global toggle&quot; which does something completely different, and really simple.<p>But what Opera had is something completely different, built in natively.