You have to click on the source language name to change it. I've chose: detect the language.

But when I select a text, it's not send in the translation window.

The next time you use it, it keeps in memory the last language pair I used, it's not always the behaviour I expect. Please, add more customization.

جيدة GOOD

This is exactly the add-on i was looking for, it's perfect. It has the same look as the site, is not cluttered and is minimal - something i cannot say for the other add-ons.

Es la extensión que más me agrada en cuestión de usabilidad.

WOW!! it really is identical to Google translate Full page!!
It has all the characteristics of it.
I liked the fact that it has the "suggest an edit" button, as the original page has and the further explanation of each word!! EXCELLENT job you did on this Addon Guys!! well done! I give all the stars!! ★★★★★ :-)

After switching to classic layout from menu I can't restore mobile UI - always classic, mobile only in new private window.
A workaround is: https://testpilot.firefox.com/experiments/side-view

Bonne traduction ! Mais je cherche un traducteur qui, automatiquement, sans demande préalable,traduit d'office toute page qui s'affiche vers la langue souhaitée. Cela existait "avant" mais qu'est-elle devenue? Si cette extension existe encore, quel est son nom à présent ? La trouve-t-on dans les nouvelles extensions de Firefox? Si elle n'existe plus, a-t-elle été remplacée par un autre système, une nouvelle extension? Si remplacée, quel est le nom de cette "nouvelle" extension? Déjà un énorme merci pour votre réponse. Bonne continuation avec Firefox, Respectueusement,
Good translation ! But I'm looking for a translator who, automatically, without prior request, automatically translates any page that appears to the desired language. It existed "before" but what has become of it? If this extension still exists, what is its name now? Is it found in the new Firefox extensions? If it no longer exists, has it been replaced by another system, a new extension? If replaced, what is the name of this "new" extension? Already a huge thank you for your answer. Good luck with Firefox. Respectfully,

Please, a customizable shortcut for opening the popup, instead of clicking the icon on toolbar, would be dope!