[ALUG] Transferring settings and data from Firefox and Thunderbird

It looks like I will be getting another laptop as my old one is reaching the end of the road. I want to be certain about what I'll be doing, hence asking. What I want to do is transfer all the bookmarks (I have *a lot*), passwords and settings for Firefox over. Is creating a profile the easiest way of doing that? I also want to ensure I have the folders of old emails saved in Thunderbird somewhere safe. Those are emails I have stored on the laptop, not online. Transferring Thunderbird's settings would be a bonus too. If I create a Thunderbird profile, will it do both of those things? Bev.