I wiped, formatted, and then installed the latest Lineage OS for my device.
When I install Firefox, before I ever browse anything and after turning search suggestions off, I see URL suggestions whenever I begin to type an address.
For example, if I type 't', the URL bar suggests twitter.com; 'ta' target.com; 'te' telegraph.co.uk; 'ti' ticketmaster.com; 'to' toysrus.com; 'tu' tumblr.com; 'aa' aa.com; 'ac' accuweather.com; etc.
I cannot find where to tun off these suggestions, and there is no reasonable way to avoid these suggestions, and 100% are completely useless for me. I want my URL bar to only offer me the suggestions of sites that I have actually visited, not all this garbage noise that Mozilla is puking into my face with.