JavaScript code set as home page under Firefox_javascript skills

Under IE, we can easily use the following code to set the homepage:

<a class="chlnk" style="cursor:hand;font-weight:bold;color:#004080;font-family:Verdana" href onclick="this.style.behavior='url(#default#homepage)';this.setHomePage('http://www.jb51.net');">Click here to make devdao.com your default homepage!</a>
[Ctrl A Select all Note: If you need to introduce external Js, you need to refresh to execute ]

However, under firefox it is Nope

To use a script to set the homepage under Firefox, you must first confirm that
signed.applets.codebase_principal_support
is set to true in the browser's "about:config"

Then use the following script:

<input type="button" value="set home page" onclick="setHomepage();">
[Ctrl A select all Note: If you need to introduce external Js, you need to refresh to execute

]