Whenever new items are introduced into the game, the Armoury Exchange chrome plugin breaks:
This happens because it can’t find matching a display_name(s) for the new item id(s) in your store.
Workaround
I discovered today that the Firefox version of this extension’s exception handling allows the items’ id values to be displayed, even if it can’t match them up to their display_name values:
It’s not pretty, but gets the job done!