The extension brings two functionalities to your Firefox browser:
* in-line translation of words;
* translation of the whole page.
Double-click or highlight a word, and a little pop-up will show the definition of it in your language.
Alternatively, you can move your mouse over the word that you want to translate while pressing down the Ctrl key.
At the top-right corner of the little pop-up, there is a "more" link which will lead you to the full definition at Google Dictionary web site. (If the language or the translation is not supported by Google Dictionary, the "more" link will lead you to Google Translate web site instead.)
To close the little pop-up, just click on any blank place on the browser. The little pop-up must be closed before you can activate another in-line translation.
Click on the Tools menu from the menu bar, and select Translate Page.
* Select your language
If your language is not in the list, read the section "Why isn't my language on the list".
* Enable select-to-translate
If it is checked, you can double-click any word or highlight a phrase to see the in-line translation.
* Enable double-click-to-translate (since version 1.5)
If it is checked, you can double-click any word to see the in-line translation. With this new option, you can uncheck the above Enable select-to-translate option which may cause inconvenience when you want to copy & paste some text from the web page.
* Enable Ctrl-hover-to-translate
If it is checked, you can press down the Ctrl key and move your mouse over the word to view the in-line translation of it.
o Aggressive mode
If it is not checked, you must press down the Ctrl key first and keep it down when you move the mouse to translate a word. If you want to know the technical detail, read the section "What is aggressive mode".