Taboo is an excellent firefox extension which allows you to book mark sites which you probably want to read later. There is already a read later plugin available but in m,y opinion its lot better and here are the reasons:-

1. Live Search in the book marked web pages i.e You can search according to title.
2. Saves a snapshot of the web page.
3. No account required.
4. You can view even in calendar format. Allows you to determine what you saved when. This is something pretty unique.
5. Shows a preview of the website when you mouse hover it. This is helpful as it makes things clear before you visit it.

The only draw back which I see is the data will not be available anywhere but if have a laptop this is something you should not miss. Try Taboo Now

Note: You will be seeing a Plus sign and a T sign on the left side of your address bar. Press + to save and T to see.