User wg9s offers several current SeaMonkey builds from latest source for WINDOWS, MAC and Linux.
SeaMonkey 2.53.4 is the new successor of 2.53.3, German version works fine for me on WIN, English Version and other OS not (yet) Tested by me.
Reports on Expereience are welcome, but please be aware that you use those builds on your own risk. I recommend to create a backup of your user profile before you start testing those builds.
I started to test 2.53.1 today, until now it works fine for me.
SeaMonkey Internet Suite 