After clicking on a download link, the following error is shown in the browser console:
Timestamp: 07.10.2013 20:09:11
Error: [Exception... "Component returned failure code: 0x80004002 (NS_NOINTERFACE) [nsISupports.QueryInterface]" nsresult: "0x80004002 (NS_NOINTERFACE)" location: "JS frame :: chrome://linkpropsplus/content/linkPropsPlus.js :: linkPropsPlusSvc.realReferer :: line 821" data: no]
Source File: chrome://linkpropsplus/content/linkPropsPlus.js
Line: 825
This happens with at least Firefox 23 and 24 in a new profile with only LPP 1.5.2 installed.
This bug also has negative effects on other addons like TabMix Plus 0.4.1.2.