Not mentioned what you want to do.

You want help fixing 57 or did you want or go back to 52.5.0 ESR as it gets support updates. No other version you went back to will.

So what would you like to do ?

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/

More information will come out slowly. New extensions are being made and some older ones being updated that can track here : http://bit.ly/2j0Anlj

Make it look a little like previous version It isn't completely possible to use the Australis design with Firefox 57, but depending on what you want, you might be able to customize the UI to look more like the old one:

   This project: https://github.com/wilfredwee/photon-australis lets you have the old tab bar appearance back in Firefox 57.
   You can remove the space around the address bar by right-clicking on the spaces, and choosing "remove from toolbar". 

Here's a more comprehensive project which affects not only tabs but brings back the old "grid-style" options menu. https://github.com/axydavid/FirefoxUI/blob/master/README.md

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

None of you suggestions help, I think because no matter how many times I uninstall/reinstall Firefox, I get a message saying I have an error in Firefox.exe at 0X3fd9945e=0X0000000. Don't know what this means but it seems to be tied to other programs for example like my mail handler. ONLY, if I uninstall Firefox completely does the error go away. I am now using Chrome. I'm guessing Mozilla doesn't care about supporting Windows 7 any longer or this bug would have been fixed by now. I switched to FF a year ago because I was afraid IE wouldn't be supported by MS much longer for Windows 7. Didn't think same thing would happen to FF.