Diễn đàn hỗ trợ Firefox

While I enjoy the capability of selecting a search engine as I see fit, I would prefer that my local drives take precedence. Is there an easy way to enable this for everyday casual use? In other words, can I specify "search local drives first, followed by the web i.e. casting a wider net to search on the world wide web, and an arbitrary third placeholder such as foreign sources (example only) or foreign news items (again, fictitious example)

I switched my default search engine from Google to Bing. As you can see in the attached screenshot, it should be searching with Bing. But for some reason the search results are always Google. How do I fix this? I haven't refreshed Firefox yet. I was hoping to avoid that.