firefox扩展如何检测加载的页面的内容类型？

Question

since my extension's pageload is triggered even when I view css or js files, i want to add another check that triggers my extension only when the current page's content-type is text/html .

//eg: at my page load handler
function onPageload(){

  // only want to proceed if content-type reflects a text/html or */html page
  if ( contentTypeIsHtml() ){
    //continue here
  }
}

what should contentTypeIsHtml() do ?

Answer 1

您可以使用document.contentType属性获取内容类型（这不是标准的DOM，但扩展程序会使用它）

Answer 2

Check out the source to the add-on JSONView, unzip the xpi and take a look at components/jsonview.js, towards the end of the source the add-on registers itself for the mime-type application/json. You could probably do something similar.