How to install Gnome 3 theme on Firefox 38.0.1?

Question

linux

After updating Firefox to 38.0.1, the theme that adapts the browser to the overall design of the shell has fallen off.
On github it is said that it is necessary to rebuild, but I won’t know where, what, but I really want to. With Fedora, and indeed with Unixlike systems, I just started to get acquainted, therefore, what is written on the github is just a frightening set of letters. Be, plz, in more detail, if there is a solution.
Thank you.

Answer 1

Gnome 3 uses gtk3 themes, and apparently firefox 38.0.1 from your repository is compiled using gtk2, which requires a gtk2 theme accordingly. Either install gtk2 themes, or manually compile firefox 38.0.1 with gtk3 included.

Answer 2

Gnome 3.51

Dr. Brown, is that you?