It’s clear from the response to this post that many people are still having problems using the Video DownloadHelper extension in Firefox on Macs. Since a slightly simpler solution has emerged since it was written, here is a crystal-clear guide that may make it easier for some users.
1. Download ffmpegX into a folder on your Mac:
2. Double click on the DMG file. Right click on the ffmpegX icon and select “Show Package Contents”:
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