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Based on Link Status, the work of fcp (https://addons.mozilla.org/en-US/firefox/addon/link-status)
It shows a pop-up when the link you're hovering has been visited before and/or when it's already in your bookmarks.
This is an upddate made to work on Firefox 4+
This page is part of the LegacyCollector website.
Disclaimer: All material on this site is property of their respective owners and available under
open licenses to the best of our knowledge. If you are an author and would like anything removed,
then please write an e-mail to legacy [at] collector dot org.