This has been one of my absolute favourite add-ons until a week or two ago, when it started not saving the screenshot thumbnail. It is shown in the save dialogue, but when I click OK, the dialogue doesn't disappear as it should, the bookmark is saved, however, but it has no picture, only an annoying blue placeholder globe representing... the internet, I guess. I don't remember updating either the browser or the plug-in (were any of those updated?), I might have updated the OS. The last thing I remember doing with the ViewMarks before it broke was mistakenly putting my custom title into the URL field, obviously making the bookmark unusable and image-less, I don't know if this has anything to do with the problem, but now you know to avoid doing that, and if the developer reads this, maybe he got a clue to how to fix it. I really hope he does, I need ViewMarks, but can't use it like this.