As you may know, Mozilla Firefox is among the most popular internet browsers available, being very appreciated by FOSS users.

The latest version available is Firefox 45.0.2, coming fixes:
- Fix an issue impacting the cookie header when third-party cookies are blocked
- Fix a web compatibility regression impacting the srcset attribute of the image tag
- Fix a regression with the copy and paste with some old versions of some Gecko applications like Thunderbird
- Fix a crash impacting the video playback with Media Source Extension
- Fix a regression impacting some specific uploads
Installation instructions:
Mozilla does not provide a repository for its Firefox browser, but the installation steps are quite easy anyway and should not create difficulties on any Linux distribution.
The latest versions of Firefox are available as pre-compiled libraries via the Mozilla FTP, so we need to download the archive (i386 or i686 for 32 bit systems and amd64 or x86_64 for 64 bit systems), extract it and run the firefox file. Also, it is advised to remove previous versions of Firefox, move Firefox to /opt and create a symlink, for an easier usage.
The below instructions should work on all the popular Linux systems, including Ubuntu, Linux Mint, Pinguy OS, Elementary OS, Peppermint, LXLE, Linux Lite, Debian, Robolinux, SparkyLinux, Fedora, CentOS, OpenSUSE, Mageia, OpenMandriva, Arch Linux, Manjaro, ROSA Desktop etc.
How to install Firefox on 32 bit Linux systems:
$ wget https://ftp.mozilla.org/pub/mozilla.org/firefox/releases/45.0.2/linux-i686/en-US/firefox-45.0.2.tar.bz2
$ tar -xjvf firefox-*.tar.bz2
$ sudo rm -rf /opt/firefox*
$ sudo mv firefox /opt/firefox
$ sudo ln -sf /opt/firefox/firefox /usr/bin/firefox
To start Firefox, just open a terminal, type firefox and hit enter.
How to install Firefox on 64 bit Linux systems:
$ wget https://ftp.mozilla.org/pub/mozilla.org/firefox/releases/45.0.2/linux-x86_64/en-US/firefox-45.0.2.tar.bz2
$ tar -xjvf firefox-*.tar.bz2
$ sudo rm -rf /opt/firefox*
$ sudo mv firefox /opt/firefox
$ sudo ln -sf /opt/firefox/firefox /usr/bin/firefox
To start Firefox, just open a terminal, type firefox and hit enter.