Was working well and has done for 4 years (I have the pro version) - had a few initial problems, but they were sorted quickly. However, after Firefox updated to v.71 it refuses to work. I have reported it, and the developer said it was sorted and to re install updated add on, which I have done - but it still refuses to function. The developer, has in the past, been very helpful in resolving any issues which might come up and to be fair going on past experience I would have given it 5 stars, but because of the current problem, which is irritating I give it 4