It is one thing to mention alternative browsers in response to specific questions or perhaps even start with, "Has anyone tried Fifth?" and some links but this reads like a pure advert. I won't delete the post but I am closing the thread. If you want to discuss Fifth I am sure they have a forum or mailing list.
If you want to discuss Opera for Linux or need help, then this is your forum. Posting straight adverts for completely unrelated browsers is off-topic and verging on spam.