Since you referenced an article with that specific title, you are likely dealing with the common frustration that
: Instead of a "Download All" button that risks duplicates, use a "Sync" button that scans the playlist and identifies new additions. Local Library Indexing
Here is a guide to fixing common issues or switching to more reliable tools as of 2026. youtube playlist downloader firefox plugin fix
Go to Settings -> Privacy & Security -> Cookies and Site Data -> Clear Data .
Corrupted cached scripts from an older version of YouTube can conflict with your newly updated plugin. Click the next to the URL while visiting YouTube. Select Clear cookies and site data . Go to Firefox Settings > Privacy & Security . Scroll down to Cookies and Site Data and click Clear Data . Check Cached Web Content and click Clear . 3. Grant Necessary Permissions Since you referenced an article with that specific
Click your ad blocker icon (e.g., uBlock Origin) while on YouTube. Click the icon to pause filtering on the site. Refresh the YouTube playlist page. Try initializing the downloader extension again. 4. Adjust Firefox Content Security Policies (Advanced)
Type about:config in the address bar and accept the warning. Search for security.csp.enable . Corrupted cached scripts from an older version of
Use the following command to pull the playlist directly through your Firefox session's authentication: yt-dlp --cookies-from-browser firefox "https://youtube.com" Use code with caution.