Great but... Rated 4 out of 5 stars
Unfortunately now and then I also experience connection problems with Chipmark. Often enough to look around for alternatives. Since I use Chipmark at work as well and have to visit certain sites frequently on a daily basis, not being able to connect to Chipmark is quite a nuisance. Lucky for Chipmark there's simply no alternative for this great add-on.
In an earlier version of Chipmark it was possible to export your bookmarks for backup purposes. This was a handy workaround in times Chipmark was unavailable.
Perhaps its time Chipmark (University of Minnesota?) should ask a fee for using their add-on, so they will be able to buy some decent servers/hosting partner. I'll be more than happy to pay for it.