I have finally found the website with different "addable" search providers. It works for both Firefox and IE. http://mycroft.mozdev.org/search-engines.html?category=12.
could you please help me to restore Google Feeling Lucky as a search provider in IE8 ? Some time ago I found a website where you could add Feeling Lucky to search providers in IE8, but aftert system reinstallation I cannot trace the page. Microsoft did a very bad thing removing the possibility of creating own search providers from their add-on site.