This plugin allows to:
- search on eur-lex.europa.eu via the
eurlexshortcut in the search bar - show hidden anchors to chapters, articles and annex in the eur-lex documents, so that you can easily create permalinks.
Once the plugin is installed, the 
will appear on your extension bar.
When you are on eur-lex.europa.eu:
- click on the EU flag;
- go to the Article or Annex you want to reference: it will be highlighted;
- click on it, and the current window will reflect its location, like if there were an anchor.
That's it :)