This add-on is pretty useful when you have many tabs opened from different sites all mixed in the tab-bar. Sometimes you can't find the tab that your are looking for. By sorting the tabs by URL will be easy find these tabs, sorting here works like a "group". It also has the option of close duplicates. Especial thanks for people at BabelZilla (http://www.babelzilla.org/) they translated this add-o
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