When comparing AdBlock Plus vs Video DownloadHelper, the Slant community recommends Video DownloadHelper for most people. In the question“What are the best Firefox add-ons?” Video DownloadHelper is ranked 18th while AdBlock Plus is ranked 25th. The most important reason people chose Video DownloadHelper is:
A number of "YouTube downloaders" will only work with YouTube. Others (maybe the same ones!) no longer work with YouTube after changes were made in the YouTube interface and encryption. But VDH just keeps on working!
Specs
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Pros
Pro Free & open source
Pro Blocks a wide selection of annoying ads
Video ads on YouTube, Facebook ads, flashy banners, pop-ups, pop-unders and much more.
Pro Works with YouTube videos, and most other sites too
A number of "YouTube downloaders" will only work with YouTube. Others (maybe the same ones!) no longer work with YouTube after changes were made in the YouTube interface and encryption. But VDH just keeps on working!
Pro Rarely fails to "see" and download video and audio streams
Many similar tools will often fail to download certain video formats or DRM protected streams. VDH fails to download 5% or less of video streams.
Pro Conversion license is very affordable ($15 lifetime license)
Pro Automatic conversion rules are very handy
Cons
Con Uses too much RAM
AdBlock+ tends to use a lot of memory, which has been documented in many use cases as well as admitted by AdBlock themselves. Considering there are alternatives out there that can block ads successfully with half the RAM usage as AdBlock, one has to wonder why this is a problem specific to AdBock.
Con Users automatically opted in to whitelist
AdBlock+ has an automatic whitelist when installed that allows certain advertisers through the blocking mechanism. The fact that these advertisers pay for this privilege makes this particular scenario rife with conflict of interest.
Con Pricy
Con UI for advanced features is a little hard to navigate
There are much worse UIs though.