Fix tempfile issues

[m-mohr]

No description provided.

[niebl]

unfortunately this does not open the browser to any temp files. I also am not getting any error messages unfortunately

[niebl]

I manage to create the correct URI but nevertheless the webbrowser would not open to the uri.
It appears that the webbrowser within flatpak also has no access to /run, so it cant make use of the absolute filepath.