I usually turn off auto-suggest. It pops up, flashing on the screen, begging for attention. It's useful for phones however because I am clumsy and have bad dexterity when using a phone. But for desktop PCs, I'm happy just typing out what I'm looking for (which has the added bonus of making my typing better over time).
> Firefox Suggest also contains sponsored suggestions from vetted partners. For instance, if someone types in “vans”, we might show a sponsored result for Vans shoes on eBay
Tells you everything you need to know about this "feature".