For some reason from time to time I keep getting this weird system messages in my working terminal emulator, unrelated to anything I do.For example:

[000:000] Browser XEmbed support present: 1
[000:000] Browser toolkit is Gtk2.
[000:001] Using Gtk2 toolkit
[000:033] Starting client channel.
[000:048] Read port file, port=33359
[000:050] Initiated connection to GoogleTalkPlugin
[000:154] Socket connection established
[000:154] ScheduleOnlineCheck: Online check in 5000ms
[000:203] Got cookie response, socket is authorized
[000:203] AUTHORIZED; socket handshake complete
[005:216] HandleOnlineCheck: Starting check
[005:216] HandleOnlineCheck: OK; current state: 3
Failed to open VDPAU backend libvdpau_nvidia.so: cannot open shared object file: No such file or directory

After some investigation I concluded that those messages ARE from firefox.However, I didn't start Firefox from terminal.

or

nsBuiltinDecoderStateMachine::RunStateMachine queuing nsBuiltinDecoder::PlaybackEnded
nsBuiltinDecoder::PlaybackEnded mPlayState=3
nsBuiltinDecoderStateMachine::RunStateMachine queuing nsBuiltinDecoder::PlaybackEnded
nsBuiltinDecoder::PlaybackEnded mPlayState=3

I have no clue how this ends up in working terminal, any thoughts ?