this post was submitted on 02 Oct 2025
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It's the button to pin a PWA to the taskbar by reading the manifest.json
https://www.maketecheasier.com/enable-progressive-web-apps-firefox/
That's from August, when support was added back after the feature being dropped in 2020.
This is for the September 16 update.
https://www.ghacks.net/2025/09/16/mozilla-firefox-143-0-adds-support-for-progressive-web-apps-copilot-on-sidebar-important-dates-in-the-address-bar/
Progressive Web-apps are a particular kind of web-app. The person you replied to just referred to "webapps", not this special kind of web-app. Firefox has always supported web-apps.
The nature of progressive web-apps means that you can use them even if the browser doesn't explicitly support them. All that explicit support does is wrap the web-app in an icon and reduced browser window.