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I want firefox sources ~/.firefoxrc automatically when I open a webpage.
~/.firefoxrc contains several javascript functions:

Array.prototype.sum = function(){
    for(var i=0,sum=0;i<this.length;sum+=this[i++]);
    return sum;
}
Array.prototype.max = function(){
    return Math.max.apply({},this)
}
Array.prototype.min = function(){
    return Math.min.apply({},this)
}

So I can use these functions in firebug console.

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Loading javascript code on startup of firefox can be done using userChromeJS.

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