Firefox users can download any YouTube video directly in the browser using dltkk.to — no extension required, no add-on installation, no privacy risks from browser plugins with access to all your tabs. Works on Firefox for Windows, Mac, and Linux.
Firefox YouTube download extensions in the Mozilla Add-ons library face the same lifecycle problems as Chrome extensions — they get removed when they violate policies, they require access to all browsing data across every website, and they break when YouTube changes its internal systems. A popular Firefox extension named Video DownloadHelper has existed for years but requires purchasing a companion app for full functionality. dltkk.to provides everything a Firefox YouTube download extension does without any installation, without browser permissions, and without any cost. The tool is a website that your Firefox downloads from — the only "installation" is opening the tab.
By default, Firefox saves downloads to the Downloads folder on your system. To change the default download location, go to Firefox menu, Settings, then under Files and Applications look for the Downloads section. You can set a custom folder or select Always ask where to save files. For frequent downloaders who want organized archives, setting a custom folder by content type (YouTube Videos, Podcasts, Music) and changing the Firefox download path each time is more organized than a single Downloads folder that accumulates everything.
Firefox is the default browser on many Linux distributions and works identically with dltkk.to. Open Firefox, go to dltkk.to, paste your YouTube URL, select format, and download. Files save to ~/Downloads by default. The downloaded MP4 plays in VLC, MPV, or any other Linux media player. For Linux users who prefer command-line tools, yt-dlp installed via pip or your distribution's package manager gives the same functionality with more format control from the terminal.
dltkk.to works correctly in Firefox Private Browsing windows. Private browsing does not prevent download functionality — it simply means Firefox does not save the browsing history for the dltkk.to tab. The download itself proceeds and saves to your downloads folder normally. Private browsing downloads are not deleted when you close the private window — the file stays in your Downloads folder as with any normal download.