If clicking the NoScript placeholder causes it to occur, & if it were a FF bug, should there be some other method to produce it, without NoScript?
Or because it did not happen in FF 14 but does in FF 15 (& later), even though NoScript is involved, does that make it a FF bug?
(Note if you use the confirmation box, once the box appears, the bug happens, so you needn't necessarily OK the confirmation. A Cancel, followed by mouse movement, followed by a click, will allow you to repeat the bug without actually playing the clip. plugin-container.exe has not yet & need not necessarily load.)
Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:22.214.171.124) Gecko/20110420 SeaMonkey/2.0.14 Pinball NoScript FlashGot AdblockPlus
Mozilla/5.0 (Windows NT 5.1; rv:17.0) Gecko/17.0 Firefox/17.0 SeaMonkey/2.14a2