Update README.md

Updating Firefox and Safari spec support status - see https://caniuse.com/mdn-api_document_adoptedstylesheets

Author: jacecotton

README.md

@@ -4,9 +4,7 @@
 [![npm version](https://img.shields.io/npm/v/construct-style-sheets-polyfill.svg?style=flat)](https://npmjs.org/package/construct-style-sheets-polyfill 'View this project on npm')
 [![codecov](https://codecov.io/gh/calebdwilliams/construct-style-sheets/branch/main/graph/badge.svg)](https://codecov.io/gh/calebdwilliams/construct-style-sheets)
 
-This package is a polyfill for the [constructible style sheets/adopted style sheets specification](https://github.com/WICG/construct-stylesheets/blob/gh-pages/explainer.md). The full specificaiton is enabled by default in Google Chrome as of version 73.
-
-Currently [Mozilla is considering implementation of the feature](https://github.com/mozilla/standards-positions/issues/103), marking it as "worth prototyping" while Apple has not publically signaled, they have been active in the standards discussions surrounding it.
+This package is a polyfill for the [constructible style sheets/adopted style sheets specification](https://github.com/WICG/construct-stylesheets/blob/gh-pages/explainer.md). The full specificaiton is enabled by default in Google Chrome as of version 73. Firefox only has support as of version 101, and Safari as of version 16.4.
 
 ## Use case
 
@@ -104,4 +102,4 @@ until the value is changed using a setter.
 
 ## A note about versioning
 
-This packages doesn't necessarily follow semantic versioning. As the spec is still under consideration and implementation by browser vendors, the features supported by this package will change (generally following Chrome's implementation).
+This packages doesn't necessarily follow semantic versioning. As the spec is still under consideration and implementation by browser vendors, the features supported by this package will change (generally following Chrome's implementation).