Get it on Firefox Add-ons — Free.Signed by Mozilla · Firefox 153+
Open the listing in Firefox, click Add to Firefox, then accept the permission prompt. In any other browser the listing cannot install it.
What you get
The same extension as the Chrome release, from the same source tree — not a cut-down port. Every feature is verified working on Firefox 153: syncing your Watch Later, bulk delete, the channel and topic breakdowns, filtering and sorting, bulk move or copy to another playlist, drag-and-drop reordering, multi-account support, bulk transcript download, and Send to Gemini Notebook.
Installing
- Open this page in Firefox 153 or newer.
- Click Get it on Firefox Add-ons above, then Add to Firefox on the listing.
- Firefox asks you to confirm the add-on and its permissions. Accept.
- Go to your Watch Later playlist and click Open Dashboard.
Updates arrive on their own through Firefox Add-ons — there is nothing to subscribe to and no reason to revisit.
Privacy, same as everywhere else
No account, and your playlist data stays on your machine — TidyWL uses the YouTube session you already have. From version 1.6.0 it sends tidywl.com a random install identifier and your lifetime counts (videos deleted, likes removed, videos moved, bulk operations, Watch Later size, from 2.0 Lineups and the days you opened the dashboard, and from 2.1 how often a free install looked at Pro and special announcements shown), never which videos. On Firefox that is the Technical and interaction data toggle under the add-on's Permissions and data — pre-ticked on a fresh install; after an update from 1.5.0 Firefox leaves it off and does not ask, so the dashboard asks you once. It is spelled out in the privacy policy. The one exception you trigger yourself is Send to Gemini Notebook: the links you picked go to Google under your own login, because that is the entire point of the feature.