It automatically negotiates with websites that do have Ruffle installed, to ensure that there is no conflict between the versions. Newer version of ruffle, either from the website or extension, will always take precedence and disable the other.
The browser extension works in Chrome, Firefox, and Safari 14+. It can be installed directly from the [Chrome Web Store](https://chromewebstore.google.com/detail/ruffle-flash-emulator/donbcfbmhbcapadipfkeojnmajbakjdc) or [Firefox Add-ons site](https://addons.mozilla.org/firefox/addon/ruffle_rs).
Or to install it manually, you can either download the [latest release](https://github.com/ruffle-rs/ruffle/releases) or [build it yourself](../../README.md), then follow the instructions below.