The Youtube Run-Timer is a free Chrome extension developed by Evil004. It falls under the category of Browsers and is specifically categorized as an Add-ons & Tools. This extension serves as an efficient tool for retiming Youtube videos.

With this extension, users can easily get the exact frame of the run being played on Youtube and calculate segments along with their total sum. The Youtube Run-Timer also offers integration with Speedrun.com, making it convenient for users to insert their times.

In the latest v1.0.1 patch, several bugs have been fixed. The framerate calculation has been changed to the "Get Frame" button, providing more accurate results. Warnings have also been improved for better precision. Additionally, visual output has been added when setting the start and end of a segment. The code has been refactored as well.

However, there are a few known issues with the extension. The UI size may not be suitable for every user, and the UI colors may also be unsuitable for some.

Overall, the Youtube Run-Timer extension is a valuable tool for retiming Youtube videos and calculating segments efficiently. It provides useful features and integration with Speedrun.com. Users should keep in mind the known issues with UI size and colors.