Also the developer is VERY responsive. I suggested an improvement this morning and, lo and behold, a couple of hours later he says it's already done and will be in the next version, which will be released by tomorrow evening at the very latest!!!
To say I am impressed is to put it mildly

My tip of the week: if you use FF as your main browser and you have a lot of bookmarks that you regularly use and search for, try this add-on (that is, if you don't know about it already).