Why can't I use download helper in FF v26?

using FF v25, download helper worked fine downloading videos from you-tube etc. After updating to v26, download helper no longer works at all. It still shows up on the add-on bar, but downloads empty files?

edmeister, thanks for replying. I don't know about v.27. I am afraid to try it as every new version seems to ruin more & more existing add-ons. Matter of fact, I have disabled update notifications, and am thinking about going back to v.25.

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