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Editorial Team
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Asked: 2026-05-30T12:38:06+00:00

I know that this question was asked earlier but the OP didn’t get any

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I know that this question was asked earlier but the OP didn’t get any suitable answer.
So the question is:

How to access page context to call some js function in FF overlay (toolbar in my case).

I have <toolbarbutton> element with onclick="nextTrack()". nextTrack declared in the included JS file. Function executes when I press toolbar button, but I cannot exec function that I’m sure exists on the page.

I cannot modify the page, because it is an external site, but I really want to make my extension.

Of course I can (and I am) use something like mainDocument.getElementById("player_play").click(), but page already has an audioPlayer object that has all ability I need: play, pause, next, prev etc.

For more cleanliness I make an extension to control an audio player for vkontakte social network (well known social network in exUSSR countries). So you can look at example page here, maybe it can be helpfull: http://vk.com/wall6843477_2327.
When you start listening the bar with controls must appear you can find lot of stuff like audioPlayer.nextTrack(); audioPlayer.prevTrack(); etc.

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1 Answer

  1. Editorial Team

    You aren’t accessing content directly, you are rather going through XPCNativeWrapper. This means that all JavaScript properties defined by the content page are invisible (which is a security feature). In your case, the simplest secure solution is to use the javascript: protocol:

    mainDocument.defaultView.location.href = "javascript:void audioPlayer.play()";

    This way you won’t be able to get a result back but from it seems that you don’t need to.

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