TBB 5.0 a3/a4 fails to download a file on right click

Steps to reproduce:

  1. Go to https://dist.torproject.org/torbrowser/5.0a4/
  2. Right click any file url, for example, "tor-win32-0.2.7.2-alpha.zip"
  3. Select "Save link as"
  4. Wait for TBB dialog asking if you want to open file with external application
  5. Press "Download file" button

Expected results: Download dialog asking where to save file should appear.

Actual results: Nothing happens

Trac:
Username: marc

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