The developer has done an exceptional job addressing bugs and significantly improving the extension in just a few days.
Please include sticky notes feature

UPDATED: This is a great alternative to Microsoft's discontinued OneNote web clipper. The UI seems a bit clunky at times, but the developer is very responsive to feedback and bug reports, and fixes things quickly. I've updated my score from 3 stars to 5.

I applause at the effort of stepping up when Microsoft dumps Firefox. Unfortunately, this extension does not work for me. It fails with a "forbidden request" error message when connection my OneNote account. I use the Office 365 version of OneNote, that might be the issue here.

fast fix!

Works pretty well! Nice to have a dedicated addon for Onenote back on Firefox. The only issue is the icon for the addon doesn't show when you pin it to the toolbar in the firefox, but this appears to be an issue under investigation (according to the github support site). This doesn't seem to stop the addon from functioning as it should.

In fact it is possible to clip into any notebook, maybe I overlooked it last time, or it's been updated. Either way, it's working quite well.

This does do what it claims to able to do, and since the original Microsoft addon has been removed from Mozilla under mysterious circumstances, I'm glad to have it.

I've deducted a star as it seems to be unable to find anything but the first notebook in alphabetical order if you have multiple notebooks. Any clippings that are intended for other notebooks have to be moved in OneNote after being saved in that top-most notebook. However an option to save in sub-sections of that notebook is available.