I didn't know Firefox had the capability to post performance traces like this!
Also... I wouldn't have thought that by default it would include screenshots of potentially private/sensitive information such as the the titles of other open tabs.
The resolution is very small anyway, I don't think people would be able to see the title. Besides that, the screenshot (or other track) can be trimmed by just unselect the track when upload the profile. (The default does not contain track of other sites)
Also... I wouldn't have thought that by default it would include screenshots of potentially private/sensitive information such as the the titles of other open tabs.