&gt;<i>Only if the browser is designed that way. If the browser has only global settings implementing per-site handling can impose the need of extension reimplementing half of the browser (in extreme case, see how Google made their &quot;extension&quot; of the IE which effectively installed the 90% of the Chrome inside of IE).</i><p>That&#x27;s not an extension running on IE to deactivate JS.  It&#x27;s a completely different rendering engine running inside an IE shell.<p>The two concepts are so different it&#x27;s not even worth commenting.<p>&gt;<i>Old Opera had what I needed built in, it worked without the need of even enabling javascript subsystem. I don&#x27;t know of any other browser able to work that way.</i><p>It&#x27;s trivial (one setting toggle) to disable Javascript in both Chrome and Safari (and I presume Firefox too).