Hi @Tymo92, welcome to our Community!
When you say open your Dropbox profile picture, do you mean you want to preview and maybe download it? I'm asking because I want to be entirely certain of your request, before I provide you with the next steps.
If this is what you'd like to do, keep in mind that currently it's not possible. You can edit, and delete it but not preview it.
Let me know more, and we'll take it from there!