Previously, you also had to download a converter for those operations on Firefox (and conversion/aggregation was not supported on other browsers). And here are 5 excellent Video DownloadHelper alternatives. It is capable of grabbing videos from various websites to let users download desired videos on computers. Video DownloadHelper is a popular extension for Firefox and Google Chrome browsers. This is also necessary if you want to perform any conversion operation on the downloaded media. Best 5 Video DownloadHelper Alternatives. This is required by the add-on to create audio+video files when audio and video data are streamed separately. It contains a build of the very popular ffmpeg video converter application. x, -extract-audio Convert video files to audio-only files (requires ffmpeg. Writing files from the add-on is necessary when downloading streams using protocols HLS and DASH. INSTALLATION DESCRIPTION OPTIONS Network Options: Geo Restriction: Video. The ability to write files from an add-on was present in Firefox but does not exists in Chrome nor Firefox (>= 57). Even if the downloaded data can be generated internally by the add-on, it is not suitable to writing big files like videos. The only ways to write a file from a browser add-on is to use the downloads API which basically takes an URL and transfers the data verbatim to the downloads directory.
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