Annotating the Web от Francesco De Stefano

Select the text of the webpage and click the end of the selection to highlight and add your own annotation or notes.
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Source code > https://sourceforge.net/projects/annotating-the-web/
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Release 1.3.0 - For security reasons the add-on has been disabled on youtube and google calendar
Release 1.2.5 - For security reasons the extension was frozen on some web pages. I have prepared a notification that alerts you after clicking on the extension icon on any web pages where the add-on doesn't work.
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Important notation:
Release 1.2.0 - Now you can toggle toolbar of extension, clicking on the icon of the add-on in top-right of toolbar of browser
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• Added comments and tags about selected text of webpage
• Save note in localStorage of your Browser
• Edit or delete annotation
• Filters and Navigation advanced in Web Annotations