Search engines use different algorithms to get search results. When you cannot find what you are looking for in one search engine results, you will try to open a different search engine and search the same to find different results.
Instead of opening another search engine to search for different results - Wide searcher helps to show search results from your primary search engine and secondary search engine in the same window and helps you save time and gives more information.
Wide searcher is available for both Chrome and Firefox browser
Wide searcher gives you the following secondary search engines as options to search parallely along with Google.
4) Internet Archive