In the FR mythology, Are there gods that supports things such as freedom, disobedience to laws, fighting against tyranny and other things like that?

There's, like, an entire pantheon of chaotic good deities. Lliira holds the freedom portfolio.

Ghaunadaur supports this sort of thing as well.

Ghaunadaur's Dogma Dogma: All creatures have their place, and all are fit to wield power. Those who hunt weed out the weak and strengthen the stock of all. Those who rebel or who walk apart find new ways and try new things and do most to advance their races. Creatures of power best house the energy of life, which Ghaunadaur revers and represents. Make sacrifices to the Eye, persuade others to sacrifice themselves to Ghaunadaur or in service to the Eye, further knowledge and fear of Ghaunadaur and in the end give yourself to Ghaunadaur in unresisting self-sacrifice. Convert all beings to the worship of Ghaunadaur. Slay all clergy of other faiths, plundering their temples and holdings for wealth to better your own lot and to further the worship of Ghaunadaur.