Glubble enhances Firefox so that your kids can see just the best of the web. As a family you can share and shape what your child sees. Glubble puts the web in the hands of your family.
a Firefox Greasemonkey script with the aim of limiting your web browsing to five minutes or so. It then pops up a window demanding to know why you're still surfing and won't go away until you give it a reason.
Windows/Mac/Unix (Firefox): The Dog Ears Firefox extension lets you mark (or "dog ear," if you will) sections of long web pages so you can easily find an important passage or pick up where you left off.