Recently the launcher application for TOR browser has been updated to 0.2.3, but upstream immediatley released an important security fix and bumped the release to 0.2.4.
The update fixes a possible signature verification bypass attack, reported by Jann Horn, and should go to stable as soon as possible. If you want to help please test the package for your Fedora release version (22-23-24) and leave karma:
If you like to update your actual package to the latest release, which contains the fix:
# dnf –enablerepo=updates-testing update torbrowser-launcher