It's not clear though, either they only tested against chrome-based browsers or Firefox isn't enabling them to do so.
edit: I answered before I go fully through the article but it does say it's only Chrome based.
> The extension scan runs only in Chrome-based browsers. The isUserAgentChrome() function checks for “Chrome” in the user agent string. The isBrowser() function excludes server-side rendering environments. If either check fails, the scan does not execute.
> This means every user visiting LinkedIn with Chrome, Edge, Brave, Opera, Arc, or any other Chromium-based browser is subject to the scan.
