When one has many tabs opened it is very easy to select URLs and add them to a collection. I often have need to switch between groups of URLs and this add-on makes this really quick and easy.
Few things are still missing: search across collections (by content, visit date, etc.), move/copy URLs between collections and thumbnail overview.
this happens to be the exact thing I needed. Maybe there are others like this, but this i sthe one that just popped up for me. Ok, clearly it is 'beta', as one can see from the 'design' (lime green? really? eww) and a few other minor glitches here and there. But the main functionality works perfectly. I save my session (of open tabs), send a link to me associate, and she gets my session and opens all the tabs. easy peasy! This is a bare bones plugin (and site) so don;t expect anything zipity-doo-dah about it... However, this has huge potential to some really awesome things. I hope the developers are looking into to tags (autotaging, tag maps, etc), groups (public/private lists) and subscriptions (i.e. when I edit my collection subscribers get the new version). Anyway, I give this 4 stars because it s a 3* as far as features offered and a 5* for how it performs those features.