NS_ERROR_FAILURE when reopening attachment window

[neilstudd]

After adding an attachment to a node, if you reopen that node's attachment dialog for a second or subsequent time, an error NS_ERROR_FAILURE gets thrown to the console (something within the minified js).

NS_ERROR_FAILURE:
https://d23c2zpg6dm0n.cloudfront.net/compiled/20141111130139/mm-compiled.min.js
Line 3

To replicate:

1. Add a node
2. Press "a" to launch attachment dialog
3. Type some text, and press Save
4. Press "a" to launch attachment dialog again
5. Wait a few seconds, and look in the dev console - an error has appeared

[gojko]

Hi,

which browser/OS does this happen with?

[neilstudd]

It's replicable in Firefox 33.1 (seen on two different machines, Win7 x64 and Win8.1 x64)
I can't replicate it in the latest Chrome.

Specifically, the error occurs when the cursor is focused over the attachment popup, and you move the cursor outside the border of the popup.