As mentioned in the main post, Greasemonkey 4 is changing to be compatible with the Browser Extension API. At its core, this set of APIs is completely asynchronous. Greasemonkeys old GM APIs are typically synchronous. There exist other user script engines which have already done the work of bridging the gap. Greasemonkey has elected to move exclusively towards a more performant asynchronous model. Eventually in the future, such scripts will be faster. The Greasespot Wiki has been updated to explain Greasemonkey 4 in detail. Heres a quick summary. Firefox How To Install Xpi' title='Firefox How To Install Xpi' />First, there is only an embedded editor. Browser Extensions have no access to the file system, so you can no longer author user scripts in your familiar text editor. There is only one object provided to user scripts now, named GM. It has several properties. One of them is info the equivalent of the old GMinfo. There are also several methods of this object get. Resource. Url, delete. Valueget. Valuelist. Valuesset. Value, xml. Http. Request. To use these methods you still need grant, and use the new name, e. GM. set. Value. The new form has a dot, where the old form has an underscore. You may specify both grants, if youd like to be compatible with Greasemonkey 4 and other user script engines at the same time. As of today, there is no support for GMlog use console. GMadd. Style, GMregister. Menu. Command, nor GMget. Resource. Text. In general these methods work like their old counterparts, but their return values are Promises. Darkstar One Patch 1.1'>Darkstar One Patch 1.1. The async and await keywords make asynchronous promises easy to work with. For example User. Script name     GM setget demo grant    GM. Value grant    GM. Firefox How To Install Xpi' title='Firefox How To Install Xpi' />There are two kinds of people in this world impossibly organized saints. Chrome at any given time. Sure, keeping. The User Agent Switcher extension adds a menu and a toolbar button to switch the user agent of a browser. Edit Article wiki How to Install Firefox Extensions. Three Methods Using Firefox to Install Extensions Automatically Using DragDrop to Install XPI Files Installing. Micro Star Ms 6577 Manual on this page. Value User. Scriptasync function console. Starting the getset demo. GM. Valuei, 0 console. This time, i was i. GM. Valuei, i1. Here the GM. Value method actually returns a promise, but the await keyword transparently converts that to its resolved value, allowing us to write code just as if the value was directly returned with neither callbacks nor promise resolution. See the documentation on async and await. If youd like your script to be compatible with Greasemonkey 4 and also Greasemonkey 3 or other user script engines, we have provided a polyfill, which makes new style API calls work on top of older engines. To use it 1 keep your old API grant line, 2 add a new API grant line, 4 require the polyfill script, 4 switch your code to use new API style and probably asyncawait. So the above example might look like User. Script name     GM setget demo require  https arantius. GM. get. Value grant    GMget. Why should you absolutely install the YouTube Unblocker in your Firefox browser The YouTube Unblockers greatest advantage is that the proxy server is really just. Selenium WebDriver NOTE Were currently working on documenting these sections. We believe the information here is accurate, however be aware we are also still. Value grant    GM. Value grant    GMset. Value User. Script. With the exact same new API style code as above. Such a script can be installed in either Greasemonkey 4 or Greasemonkey 3 or Tamper. Monkey, or Violent. Monkey, etc. and work as intended. Due to the more limited abilities that the new extension system gives us, we are currently unable to make grant none scripts work in the same way. Most importantly, they have a different connection to unsafe. Window.   For the short term at least, its a good idea to adopt clone. Into and export. Function. Naming. Do note that new style APIs have slightly different names. In short, a consistent naming style has been adopted all words and acronyms get a consistent case. So what was before GMget. Resource. URL is now GM. Resource. Url.   What was GMxmlhttp. Request is now GMxml. Gmud For. Http. Request.   In the near future the Greasespot Wiki will be updated with all details of the new APIs, including exact names with case. Feedback. We welcome feedback, reach out via the greasemonkey users discussion group.