Live Bookmarks combines Firefoxs bookmarking functionality with the dynamic nature of Rss Feeds to create auto-updating bookmark folders that list all recent entries from RSS feeds.
The removal causes quite the issues for users who make use of the feature. Mozilla announced that it plans to export the list of feeds to an OPML file which the majority of RSS readers support.
While there are some alternatives that might work for some users, there was not a real solution to regain the functionality once it is removed.
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