I finally got around to installing Ubuntu 14.04.1 with Deluge 1.3.11 and everything seems to work correctly in the default browser Firefox. I should mention that there is currently limited webui support. It should add a column in the webui and when you right click a torrent, there should be a Label...

I'm new to deluge and this plugin so maybe it's just noob-issues. Anyway, I can't seem to find the label contextmenu in WebUI? I have attached two screenshots showing that the plugin is installed/activated (also the LabelPlus column is visible in the main window/frame) but no contextmenu is shown. ...