Configurable popup blocker that blocks ALL (even user-initiated) popup windows by default. But you can easily open the blocked popup or whitelist a domain, directly from the page.
// ==UserScript==
// @name The Ultimate Popup Blocker
// @description Configurable popup blocker that blocks ALL (even user-initiated) popup windows by default. But you can easily open the blocked popup or whitelist a domain, directly from the page.
// @namespace jakub-g.github.com
// @author http://jakub-g.github.com/
// @version 0.1-20130112
// @userscriptsOrg http://userscripts.org/scripts/show/...
// @grant GM_getValue
// @grant GM_setValue
// @include *
// @exclude http*://*.youtube.com/*
// @exclude http*://mail.google.com/*
// @exclude http*://*.blogspot.tld/*
// @exclude http*://poczta.wp.pl/*
// ==/UserScript==
// Why another popup blocker?
// Built-in Firefox popup blocker blocks only the popup that were created automatically via
// script on page load etc. When you click on a button on the page, it won't block it.
// However, malicious websites can create JS code that will launch the popups whenever you click
// on any blank space on the page for instance.
// In JavaScript, functions are first-order citizens. It means you can store a function in a variable
// and pass it freely. You can also modify the native functions provided by the browser, like 'window.open'.
// Here, we override 'window.open' with our own implementation which doesn't really open the window.
// However the user may want to open a popup - cool, we stored original native window.open function
// in a variable and we will call it!
// Of course, we'd like to white list some domains. Greasemonkey offers an option to specify @exclude entries
// in the metadata block of the script. However this means you'll have to edit this text file each time you
// want to whitelist a domain. However, GM also offers a way to set config entries in Firefox storage
// (about:config entries) and we'll make use of it to dynamically add entries to the white list
// right from the page.
// The essence of the blocking code is substituting window.open with the function returning FakeWindow,
// which can be a one-liner.
// The majority of the code here is the handling of whitelisting logic and informational logging.
// Tests: http://www.popuptest.com/
(function() {
// ============================== CONFIG =================================
var bDisplayMessageOnPopupBlocked = true;
var bDisplayOpenPopupLink = true;
var bDisplayWhiteListThisDomainLink = true;
var LOG_ID = "ultimate_popup_blocker"; // HTML ID in the page
// ============================ FUNCTIONS ================================
var global = unsafeWindow; // reference to page's "window" through GreaseMonkey
/*
* Helper to create a button with inner text @text executing onclick @clickCallback,
* appended as a child of @logDiv
*/
var putButton = function (logDiv, text, clickCallback, inlineStyle) {
var button = document.createElement("button");
button.innerHTML = text;
button.style.cssText = "text-decoration:none; color:black; cursor:pointer;\
margin: 0 5px; font: 8pt microsoft sans serif; padding: 1px 3px;\
background-color:rgb(212,208,200); border-width:2px; border-style:outset;\
border-color:#eee #555 #555 #eee; color:black;" + inlineStyle;
logDiv.appendChild(button);
button.addEventListener("click", clickCallback);
};
/*
* Helper to create a button (child of @logDiv) which onclick whitelists @domain
* in internal Firefox storage.
*/
var putWhitelistButton = function (logDiv, domain) {
putButton(logDiv, domain, function(){
GM_setValue("whitelisted_" + domain, true);
});
};
/*
* Helper to create a text node with @text and append to @logDiv
*/
var putText = function (logDiv, text) {
var node = document.createTextNode(text);
logDiv.appendChild(node);
};
/*
* Return logger div, or create it ad-hoc.
*/
var getLogDiv = function () {
var logDiv = document.getElementById(LOG_ID);
if(!logDiv){
logDiv = document.createElement("div");
logDiv.setAttribute("id", LOG_ID);
logDiv.style.cssText="position:fixed; top:0; left:0; width:100%;\
padding:5px 5px 5px 29px; font: 8pt microsoft sans serif;\
background-color: linen; color:black; border:1px solid black;\
";
document.body.appendChild(logDiv);
}
return logDiv;
};
/*
* Get array of domains for which it would make sense to whitelist them.
* Sample valid outputs:
* // localhost -> ['localhost']
* // youtube.com -> ['youtube.com']
* // www.youtube.com -> ['youtube.com', 'www.youtube.com']
* // a.b.c.d -> ['c.d', 'b.c.d', 'a.b.c.d']
*/
var getDomainsArray = function(documentDomain){
// e.g. domain = www.google.com, topDomain = google.com
var d1 = documentDomain;
var domainsArr = [];
var lastDot1 = d1.lastIndexOf('.');
if(lastDot1 != -1){
var lastDot2 = d1.lastIndexOf('.', lastDot1-1);
if(lastDot2 != -1 && lastDot2 != lastDot1) {
var d2 = d1.substr(lastDot2 + 1);
domainsArr.push(d2);
var lastDot3 = d1.lastIndexOf('.', lastDot2-1);
if(lastDot3 != -1 && lastDot3 != lastDot2) {
var d3 = d1.substr(lastDot3 + 1);
domainsArr.push(d3);
}
}
}
domainsArr.push(d1);
return domainsArr;
};
/*
* Checks if domain we're currently browsing has been whitelisted by the user
* to display popups.
*/
var isCurrentDomainWhiteListed = function() {
var domains = getDomainsArray(document.domain);
var whitelisted = domains.some(function(d){
return GM_getValue("whitelisted_" + d);
}); // if any 'd' in 'domains' was whitelisted, we return true
return whitelisted;
};
/*
* "window.open()" returns Window which might be then used by the originator page
* to focus the popup (annoying splash popup) or blur it to retain focus in the original page
* (pay-by-impressions popup, I don't need it to actually see it).
* We need to return the fake window to not encounter JS runtime error when the popup originator
* page wants to call focus() or blur().
*/
var FakeWindow = {
blur: function() {return false;},
focus: function() {return false;}
};
/*
* Storing a reference to real "window.open" method in case we wanted
* to actually open a blocked popup
*/
var realWindowOpen = global.open;
/*
* This function will be called each time a script wants to open a new window,
* if the blocker is activated.
* We handle the blocking & messaging logic here.
*/
var fakeWindowOpen = function(url){
if(!bDisplayMessageOnPopupBlocked){
return FakeWindow;
}
var logDiv = getLogDiv();
logMessage(logDiv, url);
if(bDisplayOpenPopupLink){
displayOpenPopupLink(logDiv, arguments);
}
if(bDisplayWhiteListThisDomainLink) {
displayWhiteListThisDomainLink(logDiv);
}
displayCloseButton(logDiv);
return FakeWindow; // see the doc of FakeWindow
};
var logMessage = function (logDiv, url) {
global.upb_counter = (global.upb_counter || 0);
url = (url[0] == '/') ? document.domain + url : url;
var msg = ["UPB has blocked <b>", ++global.upb_counter, "</b> popup windows, last: <u>", url, "</u>"].join("");
logDiv.innerHTML = msg;
console.log(msg);
logDiv.style.display = "block";
};
var displayOpenPopupLink = function (logDiv, realArguments){
putButton (logDiv, "open the popup", function(){
realWindowOpen.apply(null, realArguments);
});
};
var displayWhiteListThisDomainLink = function(logDiv) {
var domainsArr = getDomainsArray(document.domain);
putText(logDiv, ' whitelist the domain: '); // using 'innerHTML += ' breaks event listeners strangely
putWhitelistButton(logDiv, domainsArr[0]);
if(domainsArr[1]){
putWhitelistButton(logDiv, domainsArr[1]);
}
if(domainsArr[2]){
putWhitelistButton(logDiv, domainsArr[2]);
}
};
var displayCloseButton = function(logDiv) {
putButton (logDiv, "x", function(){
logDiv.style.display = 'none';
}, 'background-color: #a00; color:white; margin:0 32px 0 0; float:right');
};
/*
* Override browser's "window.open" with our own implementation.
*/
var activateBlocker = function() {
global.open = fakeWindowOpen;
};
// ============================ LET'S RUN IT ================================
var disabled = isCurrentDomainWhiteListed();
if(disabled){
console.log('[UPB] current domain was found on a white list. UPB disabled.');
}else{
activateBlocker();
}
})();