Every time I start up the browser, it wants to download one specific file. It has to be some trivial setting to edit in home/nemo/mozilla/mozembed but I still didn't find it.
Anybody any hint?
(I already cleared browser history and usual stuff.)

Just if somebody runs in the same problem I found the solution:
I just have edited and deleted the content of .../mozilla/mozembed/downloads.json . I didn't dare to delete.
Anyway it is good to know that with adding proper json content to downloads.json you can make sailfish browser to autodownload something on every statup. That was something new for me.