Mozilla Firefox 75.0 was released today. Ubuntu security & updates repositories has published the packages for Ubuntu 16.04, Ubuntu 18.04, and Ubuntu 19.10.
Mozilla Firefox 75.0 comes with revamped address bar, which brings clean search experience. On Linux, the behavior when clicking on the Address Bar and the Search Bar changes: a single click selects all without primary selection, a double click selects a word, and a triple click selects all with primary selection.
The new release also brings official Flatpak support, improves HTTPS compatibility, and various security fixes. See release note for details.
Install Firefox 75 in Ubuntu:
For all current Ubuntu releases and derivatives, Firefox 75.0 has been made into the security & updates repositories.
Simply launch Software Updater (Update manager) and install available package updates.
For Ubuntu 20.04, Firefox 75.0 package now is available as pre-release updates for testing. It will go stable soon.