* A new toolbar button for choosing highlight color, remove all the marks and settings
* Two modes for contextmenu: (1) Shows a submenu of colors for highlighting; (2) Shows only one menu item for marking the text (The user can change color via toolbar button).

New feature: The user can move the cursor on the arrow flag to show the content of the corresponding marked text.

* New feature: Ctrl-Shift-F9 ( Command-Shift-F9 for Mac) to remove all the marks

* New: Rewritten in WebExtension
* Change: When the user highlight a selected text, an arrow flag is added on the right side of the page. Click the arrow flag to scroll the page to the highlighted text. Double-click the arrow flag will remove the highlight
* Change: New default colors for the highlight
* Known issue: The highlight colors are not customizable
* Known issue: The arrow flag does not work correctly in the frames