Step-by-step – Firefox ESR Installation in Linux Mint 20

Installing

2. 2. Setting Up Firefox ESR Repository

   Then Add Firefox ESR Linux Mint PPA

   Adding Firefox ESR PPA

   Firefox ESR Adding PPA Repository

3. 3. Installing Firefox ESR

   Finally, to Install Firefox ESR
   Simply play:

   sudo apt install firefox-esr

   Authenticate with the User’s Admin Pass.
   If Got “User is Not in Sudoers file” then see: How to Enable sudo.
   

How to Install Google-Chrome Web Browser.

How to Install Opera Web Browser.