[jungletek]

>I cannot search with Google in the search bar. (This is in Linux Mint)

It's certainly possible, it's one of the first tweaks I make on a fresh install. You may have to add a search provider, or change the default, but it's quite easy.

The only thing I can think of is that the bundled FF is old or is a fork that for some reason is not including that ability to do so in your case... I tend to use nightly whenever possible, so I don't remember what the default is or how old it is.