DDG Privacy Essentials doesn't change default search engine in Firefox

[bicodegas]

Although in Preferences it says "An extension, DuckDuckGo Privacy Essentials, defined the default search engine" and in a new tab I can see "Search with DuckDuckgo...", all the searches are still done in Google.

I'm using Firefox 60.0.2 (64-bit) and running Xubuntu 18.04 (if that helps). I've reinstalled 3 times and cleaned firefox's cache every time.
Thanks.

[drguildo]

I'm using Chrome 74.0.3729.108 and having the same issue. The extension is installed but DuckDuckGo isn't even listed as an option in the search engines drop-down.

[drguildo]

I looked into this some more and it looks like the ability for extension to set the search engine is only available in Windows and macOS.