This easy to use Task Manager works across platforms, so it automatically syncs my Firefox, my Android, my Windows at work, and other places. It sorts and filters by "Projects" (I like to say contexts = where I need to do the task) and tags (which can be assigned ad libitum).
Altogether, after trying several online task managers, my favorite.

Not as good as chrome version. Content is too large in general.

Good extension, comfortable to use.

I have a difficult time organizing and remaining on task. This extension helped me to be cognizant of my daily activities and I think it will help me become more productive.

the addon will close when I am trying to change the languages by pressing ctrl + alt

Great Add-on. Makes everything simpler to use it instead of the programm or the Website!

Good tool to track tasks