If you are using Firefox, then you have noticed that whenever you use its Searchbox to find anything, it opens the results in the existing tab and hence it overwrites the contents. Its quite irritating and we always have to open a new tab to make search.
Here is a solution for this problem. After following this trick, your search results will open in a new tab:
Type about:config in Firefox addressbar and press Enter.
Now type browser.search.open in Filter box.
Now you'll get browser.search.openintab in results. Double click on it and its value will be changed to true.