Hi, do you mean on a desktop OS like Windows, Mac, or Linux? Or on Android? '''Desktop''' First step is to confirm your preferred search engine is set as the default: [[Manage Firefox search settings]]. Then watch what happens when you are typing in the address bar. In particular, does Firefox ''say'' it is going to Search with DuckDuckGo (assuming that is your default), and then get hijacked to a different site, or does Firefox say it is going to use that other site? Next steps vary based on the behavior. However, as a general suggestion: One possible culprit would be an extension. You can view, disable, and often remove unwanted or unknown extensions on the Add-ons page. Either: * click the Extensions button (puzzle piece) on the toolbar > Manage Extensions * Ctrl+Shift+a (Mac: Command+Shift+a) * "3-bar" menu button (or Tools menu) > Add-ons * type or paste '''about:addons''' in the address bar and press Enter/Return In the left column of the Add-ons page, click Extensions. On the right side, find the "Manage Your Extensions" heading. ''If there is at least one extension before the next heading -- "Recommended Extensions" -- please continue:'' Then cast a critical eye over the list below that heading. Any extensions Firefox installs for built-in features are hidden from this page, so everything listed here is your choice (and your responsibility) to manage. Anything suspicious or that you just do not remember installing or why? If in doubt, disable (or remove). For your privacy and security, don't let mystery programs linger here. Any improvement? ''Note: Sometimes extensions can frustrate access to this page. In that case, first restart Firefox in its Troubleshot Mode and then try again.'' See: [[Diagnose Firefox issues using Troubleshoot Mode]] -- Open, not Refresh. '''Android''' Start with the default setting: [[Manage my default search engines in Firefox for Android]].