DuckDuckGo. Search with POST, so History doesn't contain any searchterms.

DuckDuckGo (POST) - Privacy-focused search engine
DuckDuckGo (POST) is a privacy-focused Firefox add-on. With this add-on, you can search using the DuckDuckGo search engine using POST method instead of GET, preventing your search terms from being recorded in your browsing history.
Add-on stats
Ranking
Other platforms
Not available on Chrome
Not available on Android
Not available on Edge
Add-on safety
Risk impact
DuckDuckGo (POST) requires very minimum permissions.
Risk impact analysis details
- High Can change search providers, which could redirect searches to malicious sites, posing moderate risk.
- Low ******* ****** ** *** ********* ********
Risk likelihood
DuckDuckGo (POST) has earned a fairly good reputation and likely can be trusted.
Risk likelihood analysis details
- High This extension has low user count. Unpopular extensions may not be stable or safe.
- Low **** ********* *** ******* **** **** * ****** **** ***** ******** *** **** ****** ** ** ****** *** *****
- Low **** ********* *** ***** **** **** * ****** **** ***** ********** *** **** ****** ** ** ****** *** *****
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