Quiery

Hi and welcome to Major Geeks. I've moved your thread to Software where it belongs.

You can use as many search engines as you want to install on your computer.

In the future, please type in complete words and sentences. It helps others help you if they can easily read your post.

 

Click the down arrow in FF at the beginning of the search address bar and you see Manage Search Engines. You can add, remove and select the search engine you wish to set as the default search engine. If you change your mind, just click the down arrow and select a different search engine.

If you wish to use more than one all the time, then bookmark this site
http://www.dogpile.com/
This uses Bing, Google and Yahoo at the same time.

This one http://www.mamma.com/
uses more than one but it isn't clear exactly what search engines it uses.