Many programmers feel that Stack Overflow is one of the most reliable places to get accurate information on programming topics.
Now, you can find what you are looking for quicker than ever: the Stack Overflow Search add-on offers you a search option in the contextual menu.
All you have to do is to highlight the text that you want to search and to right click on it. Than select the Search Stack Overflow option from the contextual menu and you are ready to go.