As shown below, it appears that all Firefox tabs are just named "Firefox" within the volume mixer. This doesn't exactly make differentiating them very easy. Is it possible to make the volume mixer show the names of the tabs instead? If not, is there any feature in the works for this that anyone may be aware of?
KDE is an international technology team creating user-friendly free and open source software for desktop and portable computing. KDE’s software runs on GNU/Linux, BSD and other operating systems, including Windows.
If you encounter a bug, proceed to https://bugs.kde.org, check whether it has been reported.
If it hasn't, report it yourself.
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Developers do not look for reports on social media, so they will not see it and all it does is clutter up the feed.