Very well made add-on. Thanks! Would be 6 star if there was
1. option to show 1st line/all of annotated texts in the sidebar jump list as alternatives to hover tips,
2. keyboard shortcut to open/toggle the sidebar.
NOTE:
You may need to close then re-open the sidebar, then switch tabs then back to update/repopulate the sidebar after annotating. ?
Notes do NOT disappear when the tab is closed, as review below claims. They stay, can be expanded, and the tab can be re-opened by right-click on the URL.
Would be useful (but not essential):
3. jump to open tab instead of opening a duplicate, as per previous review. (You can use switch tabs or Fast Tab Switcher add-on)
4. drop-down showing the annotation shortcuts.

It does what is essential for annotation work:
1. a note is placed at a position I control
2. the note header is collected in a side window that aggregates all notes from whatever windows and tabs, in particular allowing to jump to a page with the note in front of your eyes.

I only miss a jump to an opened tab.
Thanks for a neat functional piece of software!

A great addition, the interface translation is a little lacking.

Me parece un programa buenísimo, es muy útil y muy fácil de usar, me está ayudando mucho para realizar revisión bibliográfica. Muchas gracias al autor!

Really nice! Great job.

easy ，easy，very good

Just what I was looking for, thanks for author!

It's a shame that the few negative reviewers didn't give developer Javier an opportunity to resolve first. I had an issue with one website about which I wrote him, and he responded with lightning speed.

This may be the most useful add-on that Firefox offers, as the user will readily see from its description here, and in my experience it works flawlessly (with only the one exception referenced above, which Javier is reviewing).

Does the basics, and does them well.

Edit: Ahora sí funciona bien. Al reiniciar seguía sin poder usar notas de audio y video, pero al reiniciar por segunda vez el navegador se arregló.

I've been looking for an extension like this for years!
Just installed it and seems to be working as it should right now.
Thumbs up to the developer!

Nice addon! issues are being fixed by developer

It works just fine. Video and sound notes are a great idea. Thanks, long time waiting for something like this

Me es muy útil para preparar mis clases, porque puedo subrayar y sintetizar aquello que necesito que se estudien mis alumnos.