For some reason the eraser only works through the keyboard shortcuts and is only highlighting using the first colour you chose for the page.

Removing the highlighted sentence is not working for me... How to remove a highlighted sentence?

It's a nice add-on, but when it's enabled you can't select text anymore.
For this you need to disable it.
For enabling it you need to go to plugins.
It would be nice to add a button to switch between highlite and select

Nice, but I find another addon - "Snippet" - much more useful. Highlighting text is easier... Notes are attached to your highlights... And you can organize your highlights into folders and add tags to them.

All these features are not available with this addon "Highlight and Notes".

Works but can't change colors.