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Created 3.1 Greasemonkey (markdown)

Thorin-Oakenpants
2017-03-15 06:16:37 +13:00
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### Conceal History Length
This does not break history in any way. It just lies to any JS asking about it. Your actual (max) history is controlled by `browser.sessionhistory.max_entries` which is a per tab setting. You can test it at [JoDonym](http://ip-check.info/?lang=en)
```js
// ==UserScript==
// @name Conceal history.length
// @description Intercepts read access to "history.length property.
// @namespace localhost
// @include *
// @run-at document-start
// @version 1.0.1
// @grant none
// ==/UserScript==
var _window={name:window.name};
Object.defineProperty(history,'length',{
get:function()
{
return '2';
}
});
```
### Conceal windows.name
See [bugzilla 444222](https://bugzilla.mozilla.org/show_bug.cgi?id=444222). You can test it at [JoDonym](http://ip-check.info/?lang=en)
```js
// ==UserScript==
// @name Conceal window.name
// @description Intercepts read access to window.name property.
// @namespace localhost
// @include *
// @run-at document-start
// @version 1.0.1
// @grant none
// ==/UserScript==
var _window={name:window.name};
Object.defineProperty(window,'name',{
get:function()
{
//No CAPTCHA reCAPTCHA
if(/^https:\/\/www\.google\.com\/recaptcha\/api2\/(?:anchor|frame)\?.+$/.test(window.location.href)&&/^I[0-1]_[1-9][0-9]+$/.test(_window.name))
{
return _window.name;
}
else
{
if(_window.name!='')
{
console.warn('Intercepted read access to window.name "'+_window.name+'" from '+window.location);
}
return '';
}
}
});
```
### Clear window.opener
See [this](https://www.ghacks.net/2017/01/24/web-security-add-relnoopener-to-external-links/) ghacks article about rel=noopener. You can test it at https://mathiasbynens.github.io/rel-noopener/
```js
/ ==UserScript==
// @name Clear window.opener
// @description Prevents tampering with window.opener.
// @namespace localhost
// @include *
// @run-at document-start
// @version 1.0
// @grant none
// ==/UserScript==
if (window.opener != null)
{
window.opener = null;
console.warn('Cleared window.opener!');
}
```