The checksums below are a simple way for you to double-check the copy of Jaxx you are installing is genuine. You can match the checksum in your instance of Jaxx with the data below.
$ shasum -a 256 Jaxx.Liberty-2.3.9.dmg
dbf7852e460be230f42e0f95c355b847d1404870a0a0e62bc988086edf848966Download for Mac
$ certutil -hashfile Jaxx.Liberty-setup-2.3.9.exe sha256
de319bb0c7f8f864903b32c744c437a274774e84d425aeaf37add10debb28db1Download for Windows
$ shasum -a 256 Jaxx.Liberty-2.3.9-i386.AppImage
64fd0635b74713185417f8aea4ec4003a70fe0d812e5a155158a6fccc748688bDownload for Linux 32
$ shasum -a 256 Jaxx.Liberty-2.3.9.AppImage
abbbba9c63e2d930c99626c143fd0011ced337684835fb5ed10b51949cac6089Download for Linux 64
*Mac OS X Note: Depending on your system settings, the system might warn you that "Jaxx can't be opened because it comes from an unidentified developer." You can either change your system settings to allow apps from unknown developers in your "Security & Privacy" settings, or simply right click Jaxx → Open (as administrator), which will prompt you with a warning.