Read it Later (beta) is a wonderful extension for Firefox that allows you to save pages of interest to read later. It eliminates cluttering of bookmarks with sites that are merely of a one-time interest. I really use and like it.
“When you come across something you want to read later, simply click the ‘Read Later’ button and the page is instantly inserted into your reading list. Then when you have some free time, just click ‘Reading List’ and it’ll randomly pull up something for you to read (or you can choose which article to read). When you are finished, click Mark it As Read and it will be removed from your list. If you found what you read to be worth bookmarking, you can use the dropdown under Mark it As Read to add it to your Firefox bookmarks or any online bookmark service such as Del.icio.us.”