I use Evernote for stuff I want to save for later perusal.

As for getting distracted and following hyperlinks, you're at a computer, you're connected to the internet. Enter the role of "self discipline".

If that doesn't work you can look under (with Firefox) "File" and find the "print" entry. This will instantiate a persistent, highly portable copy of the page in such a way as to make it almost impossible to follow the links. You can then carry the copy to a place away from distractions (aka "The smallest room in the house") and spend as much time as you need. If you have the right kind if paper in the printer you can even use it to clean up when you're done.