With Firefox 81 on Mac, the browser window only displays one-fourth of the screen when running a Flash-based web application. This did not happen with previous versions of Firefox. When reverting back to the Extended Support Version of Firefox, this issue is not happening: https://www.mozilla.org/en-US/firefox/enterprise/#download So there is a workaround but we're supporting hundreds of clients that are using Firefox 81 on a Mac, so we need to figure out a solution without needing a workaround. Can anybody provide any insight into a solution? Thank you in advance!