You can turn off JavaScript execution in all browsers by going to about:config and setting javascript.enabled=false. It's not a button, but I think it's okay.

You can turn off JavaScript execution in all browsers by going to about:config and setting javascript.enabled=false. It's not a button, but I think it's okay. Browser have long given up trying to be document viewers... I know, and isn't it wonderful? Its very cool to have a truly cross-platform, graphical, debuggable environment! Plus the two best ones are open source (Firefox and Chromium).