https://bugs.freedesktop.org/show_bug.cgi?id=110137
--- Comment #2 from grmat@sub.red --- Neither qutebrowser nor QtWebEngineProcess worked. Now I've seen that qtbrowser is built on PyQt5, so the executable name has to be "python3", this works:
<application name="qutebrowser" executable="python3"> <option name="adaptive_sync" value="false" /> </application>
I'd send in a patch for that, but I think this will block any python3-based app, which is not the goal here.