DownloadHelper enabled in Firefox beta 15 no longer works...

I activated the Downloadhelper in my firefox 15.0 Beta last night, and I was able to download videos from youtube. Today, it no longer works. I noticed that when I try to go to "tools > media > download" just 2 seconds to download the file of 0 byte size and the bullets/icon just keep turning. Don't know what that means rotating icon. This means it is running? or the file that I am trying to download on line?
Hope someone can help me here. This is getting frustrating.

New version of VDH 4.9.10 has been released, which fixes the recent problems. Update to the new version.

Information about the release version 4.9.10

After a few changes of YouTube on 14 September, Video DownloadHelper was not able to download videos from this site, except the WEBM version using the YouTube HTML5 mode. This problem is corrected in this version of the addon.

After a few developments of YouTube on August 6, a number of users reported that all downloads did not exist. This was due to a a cookie generated by Youtube. Consistent workaround by disabling cookies before you download was not very convenient. This version of the addon takes care of this issue.

Earlier this year, other YouTube changes caused the FLV videos downloaded through the method of 'network' to have a fixed size of 1.7 MB and to be unplayable. This is now supported.

Tags: Firefox

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