Remove outdated note

files/en-us/web/api/extendableevent/index.md

@@ -11,8 +11,6 @@ The **`ExtendableEvent`** interface extends the lifetime of the [`install`](/en-
 
 If {{domxref("ExtendableEvent.waitUntil","waitUntil()")}} is called outside of the `ExtendableEvent` handler, the browser should throw an `InvalidStateError`; note also that multiple calls will stack up, and the resulting promises will be added to the list of [extend lifetime promises](https://w3c.github.io/ServiceWorker/#extendableevent-extend-lifetime-promises).
 
-> **Note:** The behavior described in the above paragraph was fixed in Firefox 43 (see [Firefox bug 1180274](https://bugzil.la/1180274).)
-
 This interface inherits from the {{domxref("Event")}} interface.
 
 {{InheritanceDiagram}}

files/en-us/web/api/extendableevent/waituntil/index.md

@@ -32,9 +32,6 @@ The `waitUntil()` method must be initially called within the event callback,
 but after that it can be called multiple times, until all the promises passed to it
 settle.
 
-> **Note:** The behavior described in the above paragraph was fixed in
-> Firefox 43 (see [Firefox bug 1180274](https://bugzil.la/1180274)).
-
 ## Syntax
 
 ```js-nolint