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There is a chance to see this addon translated in other languages? Not a big problem, but when i open the menu is the only sentence in english.

Это отзыв для предыдущей версии этого дополнения (0.1.0b4.1-signed). 

You can translate it yourself:

1) locale/en-US/pt.properties
https://github.com/Infocatcher/Private_Tab/blob/master/locale/en-US/pt.properties
2) extension description in install.rdf
https://github.com/Infocatcher/Private_Tab/blob/master/install.rdf
(create new <em:localized>...</em:localized> block)

And then "propose" changes like described here:
https://github.com/Infocatcher/Private_Tab/issues/11#issuecomment-15774546