Ended up going with delugesiphon on Chrome. Hate using google products, but solved my issue. Seems like firefox has really been abandoned in this respect. Couldn't find any plugins that work with the lastest version. Sad...

Thanks for taking a look cas. Plugin was working up until recently, makes me think it's a browser update. But for web ui they do state only up to firefox 26 is supported, so guess it was just a matter of time. Also tried Xirvik, but same error. Guess I'll have to keep looking for a better plugin.

Sorry Deluge 1.3.14 Libtorrent 1.0.9.0 deluge web log: [ERROR ] 18:30:27 json_api:285 Invalid JSON request content-type: application/json; charset=UTF-8 Traceback (most recent call last): File "/usr/lib/python2.7/dist-packages/deluge/ui/web/json_api.py", line 307, in render d = self._on_js...

When I attempt to add a torrent using webui or Xirvik plugins in Firefox I'm getting a 500 server error. Firefox v52.0.2. I can't think of what might have changed recently, never seen this error before. Running thin client on headless Ubuntu 14.

That was the fix, thanks Cas!

I think this happened because at some point as I was trying to fix my libtorrent issue, I deleted my cert, but not totally. Anyway this seems to be a VERY long-standing, known issue with Firefox, but hoping someone will have a work-around. I tried removing the server certs in Firefox, but it's still...

Installed libtorrent from source, that fixed the problem.

Tried purging every file recommended for auto remove after purging deluge, still get same error, no libtorrent version on re-install.

Also, when I do: deluge --version only deluge version is displaying, libtorrent version should also display. Obviously, libtorrent has not installed correctly. I purged deluge, deluged, deluge-web, python-libtorrent, and auto-removed the rest. Seems there is something I'm still missing somewhere tha...

I would agree, sounds like permissions. The files are downloaded as the deluge user unless you specified yourself as user. That user needs read/write access to the network location, otherwise they will not be able to save anything there.