Ktab is a bookmarking extension. It allows you to filter your bookmarks based on the site they're from, the time period you saved them during, and the tags associated with them. You can also see what your most common sites and tags were during any time period.
Freezetab can save links, RSS feeds, articles, and quotes from websites. The extension will fetch new content from you feeds in the background, and you can even edit your saved articles in a full rich text editor (with syntax highlighting for code)!
Freezetab