collaborative reading experience Rated 4 out of 5 stars
I have been using this add-on for well over a year and value most of all the highlight and sharing feature. I use it to share quotes of news articles with a diigo group - just select the quote, right click to highlight and share to group! Especially useful with the free rss feed of your shares diigo provides.
It has some inconveniences though: If you want to use it like me then you have to manually hide the toolbar, disable "public notes" and disable the "save image" features after install.
I would not want to miss it!