What happened with Firefox 25?

[Hammer Attila]

Hi Luke,

Usual I get this crash after I launched Firefox 25.0 and doed some
heading level navigations and scrolling, for example following webpages:
http://vakbarat.index.hu

Official way how can possible reverting this upgrade? After upgrade I
doed unfortunately sudo apt-get clean command.
Now I searched the Mozilla ftp site the Firefox 24.0 officialy tarball
and installed the 24.0 release in the /opt directory.

Attila