We have a new team mate as a QA (software tester). He recently started to execute the regression suites in our application and reporting bugs. When reporting the bugs in TFS, he used to attach the screenshots in that.
The issue is, he used to take the screenshots with the browser's other tabs too (online music sites, movies in YouTube, and Twitter) and also he kept some other billing and banking sites as bookmarks in the browser, which are also captured in the screenshot. Also during our DRB call he used to present his screen and we used to discussed about the bugs, and that time also I can see the other tabs and the personal bookmarks.
I personally talked with him twice before in a friendly way, recommended him to use the Windows snipping tool to capture/crop the specific area of the application for the bugs, and avoid the other unwanted stuff in the screenshots. I also asked him to hide the bookmarks in the browser or keep them under a bookmark folder. He replied that he used to follow the same approach (kept unwanted stuff in the screenshot) at his previous company and didn't find any harm in it.
Since the TFS can be accessed by our clients, and they are reviewing the bugs most of the time, I don't want the clients to make any fun based on the screenshot or ask any questions about that.
Can I report this case to my leadership team to take action, or should I simply ignore this? Or is there a polished way to let him understand the issue to act?