How to Set Your Default Search Engine in Firefox
Firefox gives you more control over your browsing experience than most browsers — and that includes choosing exactly which search engine handles your queries. Whether you're switching away from a pre-installed default or trying to lock in a privacy-focused alternative, the process is straightforward once you know where to look. What varies is which search engine makes sense for your situation.
What "Default Search Engine" Actually Means in Firefox
When you type a query directly into Firefox's address bar (also called the Awesome Bar) and press Enter, Firefox hands that query off to your default search engine. The same applies when you highlight text, right-click, and choose "Search for..." — that action also routes through your default.
Firefox separates this from one-click search engines, which are additional engines accessible via icons in the search bar dropdown. Your default is the one that fires automatically without you selecting an alternative first.
How to Change the Default Search Engine in Firefox (Desktop)
On Windows, macOS, and Linux, the steps are the same:
- Open Firefox and click the three horizontal lines (hamburger menu) in the top-right corner
- Select Settings
- In the left sidebar, click Search
- Under the Default Search Engine section, open the dropdown menu
- Select your preferred search engine from the list
- Changes save automatically — no restart required
That's the core process. Firefox typically pre-loads options including Google, Bing, DuckDuckGo, and Amazon Search, though the exact list can vary slightly depending on your region and Firefox version.
Adding a Search Engine That Isn't Listed 🔍
If your preferred search engine doesn't appear in the dropdown, Firefox still supports adding it — but the method depends on the engine.
For engines that support OpenSearch:
- Visit the search engine's website directly in Firefox
- Go back to Settings → Search → Default Search Engine
- Click Add search engine if the option appears (Firefox detects compatible engines automatically when you've visited them)
For engines not natively supported:
- Firefox extensions like Add custom search engine (available through Firefox Add-ons) let you manually define a search URL pattern
- You can also add engines by right-clicking the address bar of any search results page and selecting Add "Engine Name", if Firefox detects the site as search-capable
The manual URL approach requires knowing the engine's query format — typically something like https://example.com/search?q=%s, where %s is the placeholder for your search term.
How to Change the Default Search Engine in Firefox (Mobile)
The process differs slightly depending on your device.
Firefox for Android:
- Tap the three-dot menu in the bottom-right corner
- Go to Settings → Search
- Tap Default search engine
- Select from the available list or tap Add search engine to enter a custom one
Firefox for iOS:
- Tap the hamburger menu in the bottom-right corner
- Go to Settings → Search
- Tap Default Search Engine
- Choose from the list provided
iOS offers fewer customization options than Android due to platform-level restrictions, so the ability to add fully custom search engines is more limited on Apple devices.
The Variables That Determine Which Engine Works Best for You
Changing the default is easy. Choosing which default is where individual setup and priorities come into play.
| Factor | Why It Matters |
|---|---|
| Privacy preferences | Engines like DuckDuckGo, Brave Search, and Startpage don't build user profiles; Google and Bing do |
| Search quality needs | Some engines return stronger results for technical, academic, or local searches |
| Language and region | Regional engines (e.g., Ecosia, Qwant, Yandex) may perform better in specific locales |
| Firefox sync usage | If you sync across devices, your default syncs too — affecting all linked browsers |
| Extensions installed | Some browser extensions override or redirect search settings, which can cause conflicts |
When Your Default Search Engine Keeps Changing ⚠️
Some users find their default resets on its own. Common causes:
- Browser extensions — certain extensions (especially toolbar or shopping add-ons) hijack search settings. Check your installed extensions under Settings → Extensions & Themes
- Malware or adware — unwanted software can override browser settings persistently
- Firefox profile corruption — creating a new Firefox profile sometimes resolves stubborn reset issues
- Managed environments — on work or school devices, IT policies may lock the search engine and prevent changes
If the setting keeps reverting, the issue isn't with Firefox's search settings themselves — something else is overwriting the preference.
What Stays the Same vs. What Changes Per Device
If you use Firefox Sync, your default search engine preference syncs across desktop devices. However, Firefox for Android and iOS maintain independent search settings by default in some configurations, so you may need to set the preference separately on mobile even if desktop sync is active.
Your search history and suggestions are separate from the default engine — those are controlled by Firefox's own browsing data and address bar settings, not by which engine you choose.
The right default search engine depends entirely on what you're optimizing for — whether that's result quality, privacy, speed, or regional relevance — and that calculus shifts based on how and where you actually use Firefox day to day. 🖥️