Well Mozilla chose to do a silly thing imho. From FF 23 they removed keyword.url
from about:config. Now if anybody used some DuckDuckGo parameters on the search url, they're not there anymore because FF reads only the official DDG plugin that has no params.
Possible solutions for the moment:
- using a third party plugin
- re-enable keyword.url installing this addon
- edit manually the official DDG plugin
Personally I used the last method, but it may be not easy for everybody. If you're on linux the official DDG addon is stored in /usr/lib/firefox/distribution/searchplugins/locale/*language-here*
Edit all the languages just to be sure.