Is there a firefox extension for

I frequent message boards, and sometimes the acronyms can be far too complex to remember all the time. Is there an extension that allows you to select the text, right click and select “search this acronym at said website”?

You don’t need an extension. A QuickSearch works fine.

Bookmark the URL

Then use keyword “af” (or whatever you prefer). From then on, you can do an acronym search by typing something like “af FYI” into your location bar.