Downloading of binary files stalls at 0/0 bytes in Tor Browser based on ESR52 with e10s off
A user reported in #21340that downloading of zip file stalls reliably at 0 bytes with
[04-07 10:07:18] Torbutton INFO: External app requested
http channel Listener OnDataAvailable contract violationStalling happens as well for other binaries that need the external helper dialog, e.g. https://dist.torproject.org/torbrowser/6.5.1/TorBrowser-6.5.1-osx64_ar.dmg.
A workaround is to cancel the download and restart it on the about:downloads page.
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