Again (I do not know how many times this has be explained on this forum): Firefox's freedom issue is that it recommends the use of non-free software. Then, Mozilla uses the trademark law to help the user identify their products (the whole objective of the trademark law): you cannot call your application Firefox or Thunderbird nor uses their logos. This does not raise freedom issues (you can still exercise the four freedoms on Mozilla's software) but means that a modified Firefox (e.g., that does not recommend any non-free software) cannot be called Firefox not use the Firefox logo.

Regarding Virtualbox, it is in Trisquel's repository, it must be free as in freedom. That is the good thing about Trisquel: you can trust its developers and the FSF recommending it.

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