Download Once Watch: Hide Seen YouTube Videos

Name: Once Watch: Hide Seen YouTube Videos
Author: elanor.d

By: elanor.d Add-on

Download Once Watch: Hide Seen YouTube Videos (current and past versions) for Firefox

Latest Version: 1.1.0 Updated: a month ago

Ready to install?

Once Watch: Hide Seen YouTube Videos is available to install from Firefox Add-ons Store and for download from this page.

View source code

Daily users

4.5

2 ratings

Total downloads

Available versions

You can find the current and older versions of Once Watch: Hide Seen YouTube Videos here. You can download the archived versions or inspect their source codes.

As a free user, you can download up to 3 latest versions.

Upgrade to download older versions

Version	Download	Size	Download count	Timestamp
1.1.0	XPI · ZIP · Source code	23.54KB	0	2026-06-24

2026-06-24 · 0 downloads

XPI ZIP Source code

Install XPI file

An XPI file, short for "XPInstall," is a compressed file format used primarily by Mozilla applications, like Firefox and Thunderbird, to distribute and install add-ons or extensions. These files are similar in function to CRX files for Chrome but cater to the Mozilla ecosystem.

Simply drag-and-drop the XPI into Firefox to install the add-on.

Install ZIP file

Download the Once Watch: Hide Seen YouTube Videos ZIP file.
In Firefox browser, go to about:addons to open Add-ons Manager
Click on ⚙, Install Add-on From File
Select the Once Watch: Hide Seen YouTube Videos ZIP file from step 1. Once Watch: Hide Seen YouTube Videos is now installed on your browser.