This version is instable. Many crashes make this app unusable. - on click on message - on click on folder - on click on shortcut
Created attachment 112699 [details] crash report
This is a long known crash in the nouveau graphics driver, caused by the driver not being able to handle the multi-threaded OpenGL calls from QtWebEngine. There are some distributions (e.g. openSUSE) patching Qt to avoid this issue, and I suggest to report this to the bug tracker of your distribution.