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Firefox Quantum ceased support for extensions that use XUL or the Add-ons SDK [6] so the extension was rebased using WebExtensions APIs. As a result of Mozilla's changes, reliance upon the companion application increased. Firefox 57.0 and Video DownloadHelper 7.0.0 were released on the same day (14 November 2017).
Download manager A download manager and accelerator. ... Obscure or mask content other than a running video. uBlock Origin: GPL-3.0: No No ... Browser extension ...
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youtube-dl -F <url> The video can be downloaded by selecting the format code from the list or typing the format manually: youtube-dl -f <format/code> <url> The best quality video can be downloaded with the -f best option. Also, the quality of the audio and video streams can be specified separately and merged with the + operator. [34]
All versions of DownThemAll! below 4.0 are incompatible with Firefox 57 or above (Quantum). Version 4.0 transitioned the codebase from XUL/XPCOM to WebExtensions (HTML/CSS/JS/WASM). [11] The first 4.0 beta version was released August 21, 2019. [12] On September 1, 2019, DownThemAll! 4.0 was released, supporting Firefox Quantum. [13]
To avoid interface bloat, ship a relatively smaller core customizable to meet individual users' needs, and allow for corporate or institutional extensions to meet their varying policies, Firefox relies on a robust extension system to allow users to modify the browser according to their requirements instead of providing all features in the standard distribution.
WebM is an audiovisual media file format. [5] It is primarily intended to offer a royalty-free alternative to use in the HTML video and the HTML audio elements. It has a sister project, WebP, for images.
FlashGot was an add-on for Firefox that allowed interoperability between the Firefox browser and external download managers. It is no longer compatible with later versions of Firefox. It is not itself a download manager but is designed to allow the Firefox interface to be extended to connect to the selected external download manager.