In fact, I'm wondering which of DuckDuckGo and Startpage is the safest. What's the difference between these two?

Excellent addon, concept and search engine. I'll probably never stop using it. The only problem I detect with this addon is that it seems to take almost 100MB of RAM on FF 57 on Linux (I compared Firefox's memory footprint with it enabled vs. disabled). For memory-scarce computers such as mine, that's quite a lot. I hope you can improve this please. Congratulations to the DuckDuckGo team!

Good at finding sites. Like the fact that it does not track me. Needs to be updated for Firefox 57.0- it blocks BusinessInsider.com