There is waterfox, all the add are available to resume aero glass of the old version, here is the solution to the problem;) amused you well The problem and solved https://www.01net.com/telecharger/windows/Internet/navigateur/fiches/116863.html

 

for windows 10 1803 waterfox add glassy and stylish, classic restor

 

 

https://www.waterfoxproject.org/en-US/waterfox/new/      windows1803   and  https://addons.mozilla.org/fr/firefox/addon/glassmyfox/

If the purpose is simply to get transparency back, all you need to do is open about:config (type in the titlebar), then go to browser.tabs.drawInTitlebar and set it to false. Of course, you do also need AeroGlass.

In any case, this was quite an old post, so hopefully the OP has already solved this problem on their system.

Edited November 12, 20187 yr by Aethelflaed

I used this to tweak my firefox after v547 broke it:

https://github.com/Aris-t2/CustomCSSforFx/releases/tag/1.5.7

It's basically a bigass userchrome file (and some files required for tweaking).  You edit the userchrome to tweak the GUI.   It's how I firefox back to the way I like it.