Is there any plugin that just disables setTimeout or setInterval? Some web servers have the server side setting to force the user to logout and log back in. But it has to work in cooperation with the browser that periodically checks the site, using Javascript setTimeout/setInterval function (or HTML META tag attribute "refresh"). If the browser ignores these two Javascript functions and I don't manually refresh the page, the content in the loaded page will not be erased or grayed out (which is the current behavior of a web site I'm mostly concerned with).

This is different from preventing idle session timeout. In fact, I want to do the opposite: Never re-fetch the web page even at the expiration of setTimeout which calls a web refresh.