a JavaScript popup application appears "error debug exist...". "and is difficult to action or to get rid of

A JavaScript Application window appears "error debug: [Exception..." ['node was not found' code: 8 nsresult: "0 x 80530008 (NS_ERRORr_DOM_NOT_FOUND_ERR)" location: "chrome://ffebayhot/content/lib/Extension.debug.js line: 366"]
It is difficult to remove, and I do not see what to do with it.

This has happened

Don't know how many times

== Google search and what page open

Remove the module from e - bay and the message disappears.

Tags: Firefox

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