To enable or disable scripts on pages while the devtools are open, click the "." menu in the top right corner of the Developer Tools, click Settings and then click the checkbox for "Disable. Thank you. Use the Editor pane to edit CSS and JavaScript. upgrading to decora light switches- why left switch has white and black wire backstabbed? As for Opera Mini, the old mobile browser that hasnt been updated in a few years, technically this browser doesnt run JavaScript on the client. While youre on the site, open DevTools. In Firefoxs developer tools, you can use the following steps: The Safari browser for desktop is no longer available for Windows machines, but you can disable JavaScript on Safari on MacOS as follows: I did not try this on the latest version of Safari, but Im assuming its the same basic steps. For example, if you edit the background-color of an element, you'll see that change take effect immediately. @javamaster Here you can learn about blocking iframes on your page: For example, I made a website that disabled right-click, ctrl commands, and added a meta tag to the