The conditions to determine which tabs to be disabled can be configured at option page using regular expression based on website's url, otherwise automatic discarding will be turned off for entire tabs by default. The relevant tabs must be reloaded to be taking effect by this extension. Note that only "turning off discarding" will be taking care of, which means that this extension never turns it on back once a tab were effected even if the tab doesn't hit the conditions any more. To turn on the feature again, please configure it manually by visiting browser's discarding setting page. Also relaunching the browser itself is one of the ways to sync the actual tab's states against the configured conditions.