Heh, I didn't test Fx at all for reasons you can guess... ![Wink ;)]()
I was testing on a completely script-forbidden http page.
It never worked for me with any SeaMonkey on about: pages, even with scripts allowed and/or running the code from the Web Console instead of through NS, so I guess that is expected.
On the script-disabled http page, SeaMonkey 2.25 didn't fire the event listener at all, not even after running the test code from the Web Console or trying a new profile with only NoScript added (but no Web Console there...), so I would guess this is more likely a Gecko 28-specific bug than a NoScript bug or extension conflict.
@therube, what did you do that made it work, and on what page??

I was testing on a completely script-forbidden http page.
It never worked for me with any SeaMonkey on about: pages, even with scripts allowed and/or running the code from the Web Console instead of through NS, so I guess that is expected.
On the script-disabled http page, SeaMonkey 2.25 didn't fire the event listener at all, not even after running the test code from the Web Console or trying a new profile with only NoScript added (but no Web Console there...), so I would guess this is more likely a Gecko 28-specific bug than a NoScript bug or extension conflict.
@therube, what did you do that made it work, and on what page??