Add Explicit resource management to Firefox 141 release notes (mdn#40563)

* Add Explicit resource management to Firefox 141 release notes

* Update files/en-us/mozilla/firefox/releases/141/index.md

Co-authored-by: Joshua Chen <sidachen2003@gmail.com>

* Update files/en-us/mozilla/firefox/releases/141/index.md

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

* Update wording

---------

Co-authored-by: Joshua Chen <sidachen2003@gmail.com>
Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

Author: 3 people

files/en-us/mozilla/firefox/releases/141/index.md

@@ -26,6 +26,7 @@ Firefox 141 was released on [July 22, 2025](https://whattrainisitnow.com/release
 - The [`variants`](/en-US/docs/Web/JavaScript/Reference/Global_Objects/Intl/Locale/variants) accessor property is now supported on {{jsxref("Intl.Locale")}} instances.
   This property returns the variants associated with a locale as a string of dash (`-`) separated identifiers.
   It offers a more robust way to get and set variant subtags of a language identifier as opposed to manually parsing or modifying a locale string ([Firefox bug 1970161](https://bugzil.la/1970161)).
+- The explicit [resource management](/en-US/docs/Web/JavaScript/Guide/Resource_management) API, which includes the {{jsxref("Statements/using", "using")}} and {{jsxref("Statements/await_using", "await using")}} declarations, the {{jsxref("DisposableStack")}}, {{jsxref("AsyncDisposableStack")}}, and {{jsxref("SuppressedError")}} objects, and the {{jsxref("Symbol.dispose")}} and {{jsxref("Symbol.asyncDispose")}} well-known symbols, is now supported. These features ensure automatic cleanup of resources such as file handles or stream readers when they go out of scope, reducing leaks and simplifying error handling ([Firefox bug 1967744](https://bugzil.la/1967744)).
 
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