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Corrigé
cannot download from youtube
Please help me, i cannot download video from youtube. This is my information about browser, user agent, and ext version.
- Browser: Firefox 51.0 Ubuntu
- User Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:51.0) Gecko/20100101 Firefox/51.0
- Extension: ff 6.20
Solution

Solution
À l'étude
Hello, Reinstall the extension after an older version is uninstalled. The current version is 7.11:
Service d'assistance aux clients par UserEcho
Hello, Reinstall the extension after an older version is uninstalled. The current version is 7.11:
http://download.sf-helper.com/mozilla/helper_last.html