I have a little problem with WP Project Manager 0.4.2, WordPress 5.1 and Firefox 19.0.2 on MacOS X.8.3 . Normaly, when my cursor is on the title of a todo list, a small box with two icons (delete or edit) appear on the left. When I try to click on the "edit" icon of a todo list, this icon disapear when my cursor approach an I was unable to edit the todo list.
I don't have this issue with Safari 6.0.3 then I use it instead of Firefox.
Thank's for this great and simple extension!