This extension isn't available on chrome web store yet, meanwhile you can install it into your chrome browser manually by following these steps:
- Download and extract the TubeMark project.
- Go to chrome's Extensions page by visiting chrome://extensions
- Enable developer mode on your browser with the "Developer mode" toggle switch on the top right corner of the Extensions page.
- Click on "Load unpacked" button on the Extensions page, and select the TubeMark project directory from step 1 and hit "OK".
The TubeMark extension should now be installed and ready to use on your browser.
While playing a youtube video, you'll see a Time-Bookmark icon at the end of the video player controls. Click on the icon to bookmark the current timestamp and add notes in the window that appears. All the earlier bookmarks created for the currently playing video are also listed in the TubeMark window. You can view notes, jump to a time or delete the TubeMark. You can drag the TubeMark window around the screen to appropriate position by clicking and dragging it by the Blue section.