App with good functionality. Select some text (i.e. with mouse). Save your changes and maintain them in the Textmarker history. Textmarker can store your data locally; good for privacy. Also in case you have a Firefox sync account the highlights can be synchronized between your devices. Undo/Redo your Textmarker actions using keyboard shortcuts. Settings and saved highlights can be saved to a local file. Sticky Notes: Use context menu (right mouse button) for attaching a note to a highlight. Sometime doesn't restore the saved highlights because i.e. the highlights are on a page that constantly changes its content, but mantains the text in the history.