I have a problem regarding the adding of new searching engines. To avoid Google and its data collecting, I would like to add the searching engines "Ixquick" and "Startpage" (both by the same company) to my Firefox. Instead of using cookies, both above mentioned searching engines allow to do ones settings (language, searching results etc.) and generete an URL of it. I would like to use these URLs as chooseable searching engines in the right corner of my Firefox browser, where I also can choose for instance Google, Wikipedia and so on.
I'm using Ubuntu 13.04 with its special/customized Firefox (22).
The problem is:
1) If directly on the pages of the searching engines Ixquick and Startpage with the specially generated for me URL, I choose "Add to Firefox", then on "Install" - and nothing happens. With both the https version, which I would prefer, and the http version. So, to add these searching engines directly from their web pages to Firefox, seems not possible.
2) Then I tried to search in Firefox for "Add Ons". There, I found Ixquick and Startpage, however, not with my preferenceds, but the normal page versions, and unfortunately, just in English. But ok, as the other option (nr. 1) did not work, it would be better than to not have it. But as I click on "Install" this add ons, it is not possible and I'd always receive a message "You can only install this add on to a Mozilla based Firefox browser" (or somehow similar).
This leads me to the conclusion that maybe the special Ubuntu Firefox version has some difficulties ...?
Or would there be another option to install finally the serching engines I want to have?
Thank you for your attention and for any help in advance.