If those add-ons are essential to you, then you will probably need to downgrade to Firefox 52 ESR (get it here: https://www.mozilla.org/en-US/firefox/organizations/all/) but be aware that FF 52 will be much slower than Firefox Quantum.

Hello Thanks for your reply. Can I just clarify. Will the ESR, once installed, recover the TabGroups data that was in normal FireFox prior to the auto update to v57 (Quantum)?

BirchBehav said

Hello Thanks for your reply. Can I just clarify. Will the ESR, once installed, recover the TabGroups data that was in normal FireFox prior to the auto update to v57 (Quantum)?

Yes, that should work then again.

Fwiw, I haven't noticed any speed difference with the old and new version of Firefox.

There are ways to fix that. Start Firefox in Safe Mode {web link} by holding down the <Shift> (Mac=Options) key, and then starting Firefox.

A small dialog should appear. Click Start In Safe Mode (not Refresh). Is the problem still there?

https://support.mozilla.org/kb/Firefox+is+already+running+but+is+not+responding

https://support.mozilla.org/en-US/kb/firefox-slow-how-make-it-faster

https://support.mozilla.org/en-US/kb/firefox-uses-too-many-cpu-resources-how-fix

https://support.mozilla.org/en-US/kb/firefox-uses-too-much-memory-ram

https://support.mozilla.org/en-US/kb/firefox-hangs-or-not-responding

Web Extensions are evolving and many of them are changing to be compatible with the new Firefox 57. Tracking them here: http://bit.ly/2j0Anlj. Another URL in article below : https://www.howtogeek.com/333230/why-firefox-had-to-kill-your-favorite-extension/

How about looking at these 2 URL's first : https://www.howtogeek.com/333110/how-to-customize-firefox-quantum-and-remove-the-white-space-around-the-title-bar/ and The name is not descriptive enough : https://www.howtogeek.com/332449/whats-new-in-firefox-quantum/

This the best way to uninstall Firefox. Then Delete the Mozilla Firefox Folders in C:\Program Files and C:\Program Files(x86) Then restart system. Then run Windows Disk Cleanup. Then run it again and click the button that says Cleanup System Files. Note: your Firefox Profile is saved. But you should make a back up before you do : https://support.mozilla.org/en-US/kb/back-and-restore-information-firefox-profiles

Going back : unfortunately 56.0.2 is no longer safe to use for every day use, but 52.5.0 ESR is! It will continue to get security updates until May 2018, and you can download and install it from this page: https://www.mozilla.org/en-US/firefox/organizations/all/ Note : Legacy Extensions will be deleted or removed in any version update after May 2018.

Please let us know if this solved your issue or if need further assistance.

I don't think it is broken and I understand why mozilla had to modernize, I just think this whole process could have gone a lot smoother.

It sounds like v52.5.0 ESR is the better option. Gives me time to change how I use firefox and get replacement ad-ons, before moving to Quantum.

As I install ESR, the wizard puts it, by default, in the same location as the current one. "C:\Program Files (x86)\Mozilla Firefox\" This will overwrite the Quantum, right?

I kinda don't want to do that, just precautionary. I want to be satisfied that I have recovered the data first.

So how can I install ESR alongside Quantum? Is it a simple case of installing it into a new folder "C:\Program Files (x86)\Mozilla Firefox2\"?

Thanks.

Problem here with legacy add-ons is most aren't money maker that is why they don't update and some will probably never update. FF doesn't pay them to update nor help them with R&D to update so if one thinks this will happen sooner then later is drinking a whole lot of Koolaid here. If a legacy add-on was a security issue then Mozilla should call it out but instead it breaks or disable it. That is no way to really inspire confidence to use FF57 or later. As far as I am concern FF56.0.2 work and I have no issue as I don't go to dark nets nor click on phishing links. I also had create my own "hosts" edit that blocks popups and adware so any sites that uses it never shows up. But how FF57 was released and failure to acknowledge it broke alot of Add-Ons but offer "NO" real solution to restore them back but only saying to update. I have real cynicism that they will really admit they destroyed FF reputation forever with FF57 debacle. It only take one spectacular fail to ruin it. Now it is to alternative FF version is where I will be going. What they should do is fix the Add-on legacy and permit them to work and let the USER decide this for themselves not think they know better what the user needs. A NEW release of FF57.0.1 that restores and removes this Policing of add-ons and Extensions and Plugins will allow the USERs themselves to decide what they want.