Downgrading from Firefox 57 to 56 could break things and data loss can also happen, but Mozilla has taken measures to avoid these, so going back to earlier version from Firefox Quantum, may not cause any issues to you.
After Firefox 57 release on November 14, Firefox users on 56 will be upgraded to version 57. If they don’t like the rectangular tabs ,which Photon UI brings or the new UI or the fact that their old legacy add-on no longer work can eventually make them revert to Firefox 56.
But doing so may break storage and these subsystems: Quota Manager, IndexDB and Cache API. Mozilla is aware of this, it has done tests and patched Firefox 57 (currently in beta) for this not to happen.
How to downgrade from Firefox 57 to Firefox 56
- Uninstall Firefox 57.
- Control Panel > Programs > Programs and Features > Select Firefox 57 and click ‘Uninstall’.
- After that, visit this page and download and install Firefox 56 version.
- That’s it! You’ve downgraded to Firefox 56 from 57.
Note: Do remember, using userChrome.css file offered by Classic Theme Restorer you can still able to modify Firefox 57 UI.
Thanks!!! I was reading about Firefox Quantum the other day and all the problems that it caused for extensions people commonly used and thought, “I guess I won’t be downloading that.”
I didn’t realize that it would automatically download and screw everything up so now I’m going to have to uninstall it so I can get the extensions I use everyday to work again. Ugh they should have asked before shoveling this on.
Yes and the other thing to consider is that if you re-install an older version of firefox, what’s going to stop them from updating it again, then you are back to square one. They should give you the option of updating instead of shoving it on to us.
57 firefox distrib file kicked out ALL my EXTENSIONS !!! Is it normal for you?
Of course !!! they should have asked before shoveling this on !!!
Sorry didn’t get you. Please be more clear about the issue you’re having.
I do specific marketing with Firefox and unfortunately the auto update with 57 killed one of my important add ons.
I uninstalled, went back to 56, and as soon as you load it up, it downs the update. After a restart of the browser, you’re back at 57.
This time I disconnected from online while reinstalling. I selected NEVER CHECK FOR UPDATES. Guess what? It STILL updates? Tried again, this time I checked “CHECK FOR UPDATES BUT LET ME CHOOSE TO INSTALL”. Nope. No go.
Very frustrating. I’m sure it’s a great browser, but for my purposes I need this ONE SPECIFIC add on to work, and it doesn’t.