Remove experimental pref dom.events.script_execute.enable (#43402)

Author: mathewhodson

files/en-us/mozilla/firefox/experimental_features/index.md

@@ -357,21 +357,6 @@ The [`color-mix()`](/en-US/docs/Web/CSS/Reference/Values/color_value/color-mix)
 
 ## APIs
 
-### Removal of `beforescriptexecute` and `afterscriptexecute` events
-
-The non-standard events [`beforescriptexecute`](/en-US/docs/Web/API/Document/beforescriptexecute_event) and [`afterscriptexecute`](/en-US/docs/Web/API/Document/afterscriptexecute_event) on the {{domxref("Document")}} interface, and [`afterscriptexecute`](/en-US/docs/Web/API/Element/afterscriptexecute_event) and [`beforescriptexecute`](/en-US/docs/Web/API/Element/beforescriptexecute_event) on the {{domxref("Element")}} interface are on the path to removal. They have been disabled in Nightly.
-([Firefox bug 1954685](https://bugzil.la/1954685)).
-
-| Release channel   | Version added | Enabled by default? |
-| ----------------- | ------------- | ------------------- |
-| Nightly           | 139           | No                  |
-| Developer Edition | 139           | Yes                 |
-| Beta              | 139           | Yes                 |
-| Release           | 139           | Yes                 |
-
-- `dom.events.script_execute.enable`
-  - : Set to `true` to enable.
-
 ### Notification actions and maxActions properties
 
 The {{domxref("Notification/actions","actions")}} read-only property and the [`maxActions`](/en-US/docs/Web/API/Notification/maxActions_static) static read-only property of the {{domxref("Notification")}} interface are supported in Nightly on desktop.