Why am I having trouble making any download helper work?

I have a new MacBook Air. I have tried downloading several Download Helpers to download videos from YouTube, but none seem to work. When I downloaded the product "Dowload Helper" I did see an icon on the tool bar. When I would open Firefox I would see it in color momentarily, then it would "ghost". It would never activate or spin on any videos.

stuart7491,
Firefox is released on a posted 6 week schedule, so their is no reason for any add-on developer to be caught by surprise when their add-on stops working or needs to be updated.
https://wiki.mozilla.org/RapidRelease/Calendar#Future_branch_dates
Central (Nightly), Aurora (aka Developer Edition), Beta, and Release
All "channel" versions are available for anyone that wants to "test" them, to see what is "coming down the road", or to contribute to the development of Firefox.
The "life cycle" of each new version of Firefox is 24 weeks.
6 weeks in the Nightly channel in Alpha 1 development.
6 weeks in the Developer Edition / Aurora channel - Alpha 2.
6 weeks in the Beta channel - "fit and finish" stage. ''(And very rarely a new, smaller feature is added in Beta when it was developed off the normal "channel route" in secret. Has happened just once, iirc, somewhat recently.)''
Then 6 weeks as the latest Release version, before the next Release version comes out.

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