Closed captioning is not supported by FireFox's QT Plugin



Plugins Graveyard
QuickTime (Apple)
6 years ago
a year ago


(Reporter: Patrick Besong, Unassigned)





6 years ago
User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.7; rv:10.0.2) Gecko/20100101 Firefox/10.0.2
Build ID: 20120215223356

Steps to reproduce:

Playing a movie in FireFox that has SCC closed captions does not display the captions. I play this movie in Safari and I get a CC button on the playbar and it displays closed captioning:

Actual results:

Playing the same movie in FireFox does not give me the CC button, so no captions are available.

Expected results:

There should be a CC button on the playbar if SCC captions are available.

Comment 1

6 years ago
The SCC captions were added to the QT movie using Apple's ClosedCaptionImporter.component plugin for QT.
The browser knows nothing about captions, that are Plugin internals.
Did you test this with a different browser since Safari uses AFAIK OS X internal interfaces.

Comment 3

6 years ago
Yes, it also does not work in Opera either. I thought since both Safari and FireFox used the QT plugin for the browser that there was some difference in FireFox's implementation of the plugin.
I guess that this functionality isn't available if you use the normal npapi plugin and safari might use some OS internal APIs.

The best would be to ask Apple but that seems to me as user like a big black hole.
Component: Untriaged → QuickTime (Apple)
Product: Firefox → Plugins
QA Contact: untriaged → apple-quicktime
Version: 10 Branch → unspecified

Comment 5

6 years ago
Thanks for your quick response. I will see what Apple folks have to say.

Comment 6

a year ago
Closing old bugs in the Plugins component. We aren't going to track issues in 3rd-party plugins in the Mozilla bug tracker. In addition, support for NPAPI plugins will be removed at the end of this year; for more details see the post at

If there is a serious bug in Firefox, it needs to be filed in the "Core" product, "Plug-Ins" component.
Last Resolved: a year ago
Resolution: --- → INCOMPLETE


a year ago
Product: Plugins → Plugins Graveyard
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