Yes, as there is a bug report which for me seems unsolved.
KDE
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.
Plasma 6 Bugs
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.
IIRC there's a workaround that involves symlinks and/or copying some json files into the Firefox folder under .var, but I don't quite remember how it works.
Please let me know, I need to get 1password integration working with the Firefox flatpak, and iirc it's the same fix.
Yes. Because it comes in two parts. The OS level package and the browser extension, if the extension can't communicate with the OS level package then it won't work.
I can swear I found a workaround for this, but I am no longer using the flat oak. I will dig through my notes and share a link if I can find it