How can I sign up for a Firefox account?

I want to back-up bookmarks and history, but the Sync "application" on my android device "cannot connect to network" and the webpage only provides a never ending swirl, even on a laptop. (Yes, 'this is a question to ask at mozilla support'... which requires a Firefox account.) Alternately, is there any browser that allows this manually, exported to some .txt or other file? Edit: trying to install xBrowserSync, but it won't. I have a few versions, but each has this problem.   I scanned each at VirusTotal first, of course.