Rated 5 out of 5 stars
Does what it claims. Flawlessly and instantly sends tabs from my Firefox browser to my phone and vise versa. Bookmark sync is also function.Does require some computer savviness to set properly. Hense the bad reviews by people that don't know how to work it.
Side note: Although you cant move the icon in Firefox, that is hardly a hinderance. Customizable keyboard shortcut is the way to go.