How do I downgrade Firefox 56 to 52esr?
65451
How do I install Firefox 52 ESR on 16.04?
1520
How to install software or upgrade from an old unsupported release?
3612
Can I downgrade to Mavericks after installing Yosemite (beta/developer preview)?
105335
How do I upgrade my Ubuntu server from one LTS version to another? Is this safe?
7095
How do I install different (upgrade or downgrade) PHP version in still supported Ubuntu release?
33540
How can I switch a 32-bit installation to a 64-bit one?
7580
How to safely upgrade from an older Ubuntu version to a newer one?
93002
How can I get Firefox to use Dolphin instead of Nautilus?
144800
How to enable Moonlight/Silverlight 5 on firefox?
1687
How to revert software sources back to default?
47002
How do I downgrade to Subversion 1.6?
128691
How to downgrade PHP from 5.5.9 to 5.4 in Ubuntu 14.04 (Installed with LAMP)
64855
Website display issues in Firefox 57 Quantum
143713
Upgrading Firefox fails. lzma error: compressed data is corrupt
11547
How to remove `t=canonical` from Firefox browser searches made on DuckDuckGo?
137524
how do I downgrade google chrome?
55414
Is Firefox 57 multithreaded?