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Extension Development: Frozen Firefox scrollbar and dis-functional hot-keys

Posted on 2011-02-20
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Last Modified: 2013-12-07
Hello all,

I am writing a Firefox extension which creates a Java applet in the page.

function addApplet(aDocument,url,classfile,archive) {
if (navigator.javaEnabled()) {
var anApplet,body;
body = aDocument.getElementsByTagName('body')[0];
anApplet = aDocument.createElement('applet');
anApplet.setAttribute('CODEBASE',url);
anApplet.setAttribute('code',classfile);
anApplet.setAttribute('archive',archive);
anApplet.setAttribute('name',"Applet");
anApplet.setAttribute('width',"0");
anApplet.setAttribute('height',"0");
body.appendChild(anApplet);
}
}

The JAR file loaded from the applet is 500KB in size. I noticed that sometimes the extension causes Firefox's vertical scrollbar to freeze and the hot-keys to stop working. The scroll-bar and hot-keys work fine if I prevent the extension to append the applet to the page.

Another weird behavior is -- on the frozen page if I click inside any text/search box or even address bar the scroller and the hotkeys begin to work again. The same thing happens if I switch tabs or minimize the browser window.

I am using Firefox 3.6.12 on WindowsXP.

Please help me if you have an idea regarding this or if I should provide more information.

Thanks
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Question by:imreaper
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Accepted Solution

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imreaper earned 0 total points
ID: 34940532
I think I have found a way around to this problem:

Solution:
This behavior is the default since JDK 1.3. However you might need to prevent the applet from getting focus on startup, for example, if your applet is invisible and does not require focus at all. In this case, you can set to false the special parameter initial_focus in the HTML tag, as follows:

<applet code="MyApplet" width=50 height=50>
*<param name=initial_focus value="false">*</applet>

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