Vocabulary Highlighter is a add-on for Firefox, it can highlight all words that were added into a list. Use this add-on to study languages or be informed of the information you are interested in.

How to use:
1. Select a single word or a group of words on a web page.
2. Right click, choose Vocabulary Highlighter > Add. A dialog will appear. Add a note if you want, choose OK.
3. The add-on will find the selected text on any opened web pages and highlight them. Newly opened web pages will also be affected.
4. If you hover the mouse over a highlighted text, a tooltip will display for its note.

How to edit (or remove) highlighted text:
* Right click on the highlighted text, and choose Vocabulary Highlighter > Edit (or Remove).

How to show the added word list:
* Without selecting any text, right click on a web page, and choose Vocabulary Highlighter.

The license of this software is Freeware, you can free download and free use this browser plug-ins software.