WasteNoTime, which also comes in a version for Apple Safari, is closely modeled after Firefox add-on . Like LeechBlock, it lets you configure a blocking schedule, and easily add websites to block. For example, you can ask it to let you waste up to 30 minutes in aimless browsing, between 9 a.m. and 1 p.m., and then browse your favorite websites, knowing the add-on will just stop you when your time is up.

One of WasteNoTime's few interface shortcomings is the lack of visual indication when browsing a blocked website. On Google's browser, to verify that the current website is indeed blocked and check how much time is left, you must click the WasteNoTime button on the Chrome toolbar.

As soon as you exceed the time quota, WasteNoTime will redirect you to a block page instead of the time-wasting website you were trying to get to. The page asks, "Shouldn't you be working?" and displays rotating motivational quotes. You can also replace the default block page with any other page of your choice.

Just like LeechBlock, WasteNoTime lets you protect the options screen with a long string of randomly generated letters and numbers. If you want to change the options (to unblock a website, for example), you'll have to type that case-sensitive string without making any mistakes. This takes a moment and gives you a chance to think about what you're trying to do, and resist temptation.

Unfortunately, all it takes to foil WasteNoTime is just a single keystroke -- Ctrl+Shift+N. This key combination instantly launches Chrome's Incognito mode, and by default, add-ons don't run in this mode.