I get this warning in FF when developing a site of mine. I can't find any real info about it and how to fix this.
the character encoding of a framed document was not declared. The document may appear different if viewed without the document framing it.
...e)});else for(var g in a)ca(g,a[g],c,e);return d.join("&").replace(bD,"+")}}),f....
jquery....min.js (line 4)
You need to put
<meta http-equiv="Content-type" content="text/html;charset=UTF-8">
In the head of the iframe or whatever charset encoding you are using.
来源：https://stackoverflow.com/questions/13491641/character-encoding-of-a-framed-document-was-not-declared