Hey there, I’ve walked dozens of people through fixing this exact annoyance—let’s get those intrusive search dropdowns turned off for good. Here’s the straightforward, no-nonsense process:

• First, open Firefox’s advanced settings by typing about:config into the address bar and hitting Enter. You’ll see a warning about modifying advanced settings; just click the "Accept the Risk and Continue" button (this specific tweak is totally safe, I promise).
• In the search bar at the top of the about:config page, type browser.urlbar.suggest.searches. This will filter directly to the setting we need to adjust.
• By default, this setting is set to true. Double-click the entry to toggle it to false—or right-click it and select "Toggle" from the menu if you prefer that method.
• That’s it! The search dropdown suggestions will stop popping up immediately—no need to restart Firefox.

Bonus Tip #

If you also want to disable address bar suggestions based on your browsing history (not just search queries), you can repeat the same process for browser.urlbar.suggest.history—toggle that to false as well.

内容的提问来源于stack exchange，提问作者Ray McGarry