Refused to apply inline style because it violates the following Content Security Policy directive


So, in about 1 hour my extensions failed hard.

I was doing my extension and it was doing what I pretended. I made some changes, and as I didnt liked I deleted them, and now my extension is throwing error:

Refused to apply inline style because it violates the following Content Security Policy directive: "default-src 'self'". Note that 'style-src' was not explicitly set, so 'default-src' is used as a fallback.

What causes this error?

I made my changes in:


<!DOCTYPE html>
<html ng-app="PinIt" ng-csp>
        <link rel="stylesheet" href="css/popup.css">
        <script src="js/lib/jquery-1.8.2.min.js"></script>
        <script src="js/lib/angular.min.js"></script>
        <script src="js/app/app.js"></script>
        <script src="js/app/popup.js"></script> 
    <body id="popup">
    <div ng-controller="PageController">
            <div id="elem">{{title}}</div>
                <li ng-repeat="pageInfo in pageInfos" style="list-style: none">
                    <div class="imgplusshare">
                    <img src={{pageInfo}} class="imagemPopup"/>
                    <ul class="imas">
                      <li id="liFacebook" ng-click="fbshare(pageInfo)">
                      <img src="facebook_16.png"/>Facebook
                    <li id="liTwitter" ng-click="twshare(pageInfo)">
                    <img src="twitter-bird-16x16.png"/>Twitter
                    <li id="liGooglePlus" ng-click="gpshare(pageInfo)">
                    <span><img src="gplus-16.png"/>Google+</span>
                    <li id="liEmail" ng-click="mailshare(pageInfo)">
                    <span><img src="mail_icon_16.png"/>Email</span>




  myApp.service('pageInfoService', function() {
        this.getInfo = function(callback) {
            var model = {};

            chrome.tabs.query({'active': true},
            function (tabs) {
                if (tabs.length > 0)
                    model.title = tabs[0].title;
                    model.url = tabs[0].url;

                    chrome.tabs.sendMessage(tabs[0].id, { 'action': 'PageInfo' }, function (response) {

                        model.pageInfos = response;



    myApp.controller("PageController", function ($scope, pageInfoService) {

        pageInfoService.getInfo(function (info) {           
            $scope.title = info.title;
            $scope.url = info.url;
            $scope.pageInfos = info.pageInfos;
            $scope.fbshare =  function($src) {
            $scope.twshare =  function($src) {
            $scope.gpshare =  function($src) {
            $scope.mailshare =  function($src) {
   {url:"mailto:?subject=Imagem Partilhada por PinIt&body=<img src=\""+$src+"\"\\\>"});



Here is my manifest file:

    "name": "PinIt",
    "version": "1.0",
    "manifest_version": 2,

    "description": "Pin It",
    "icons": {
        "128": "icon128.png"
    "browser_action": {
        "default_icon": "img/defaultIcon19x19.png",
        "default_popup": "popup.html",
        "default_title": "PinIt"
    "content_scripts": [ {
    "js": [ "js/lib/jquery-1.8.2.min.js", "js/app/content.js", "js/jquery-ui-1.10.3.custom.js" ],
    "matches": [ "*://*/*" ],
    "run_at": "document_start"
    } ],
    "minimum_chrome_version": "18",
    "permissions": [ "http://*/*", "https://*/*", "unlimitedStorage", "contextMenus", "cookies", "tabs", "notifications" ],
    "content_security_policy": "default-src 'self'"

any sugestion?

This question is tagged with javascript google-chrome-extension content-security-policy

~ Asked on 2013-07-20 21:21:42

The Best Answer is


You can also relax your CSP for styles by adding style-src 'self' 'unsafe-inline';

"content_security_policy": "default-src 'self' style-src 'self' 'unsafe-inline';" 

This will allow you to keep using inline style in your extension.

Important note

As others have pointed out, this is not recommended, and you should put all your CSS in a dedicated file. See the OWASP explanation on why CSS can be a vector for attacks (kudos to @ KayakinKoder for the link).

~ Answered on 2013-08-25 11:08:50


As the error message says, you have an inline style, which CSP prohibits. I see at least one (list-style: none) in your HTML. Put that style in your CSS file instead.

To explain further, Content Security Policy does not allow inline CSS because it could be dangerous. From An Introduction to Content Security Policy:

"If an attacker can inject a script tag that directly contains some malicious payload .. the browser has no mechanism by which to distinguish it from a legitimate inline script tag. CSP solves this problem by banning inline script entirely: it’s the only way to be sure."

~ Answered on 2013-07-21 03:37:44

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