According to the Linux Mint that Google Search Engine doesn’t provides funds hence it doesn’t include it according to the resources.
Linux Mint contains following Search engines in default versions
Linux Mint Provides reason for not including the commertial versions of serch engines on mozilla firefox according to the resources.
How to Change the Search Engine to Google on LinuxMint Firefox.
Step-1 ( Make Google as a Default Search Engines Addons)
The Addon for Google SE and hit on Add to firefox Button.
Make Google as a Default Search Engine addon page looks like this.
Step-2 (Make Google Default Search Engines)
After opening check the box Make this the current search engines and hit on Add Button.
Step-3 (Restart the mozilla firefox browser to confirm the changes)
After restarting the mozilla browser the adress bar and serch bar looks like this.
Congratulations now you have sucessfully integrated the default search engine as Google. For support on this procedures and help use the comment section below.