I don't know what is happening but Ublock Origin has suddenly stopped blocking ALL adverts - cannot add new ones, can't edit - can't do anything - sick of huge Google ads spread over every damn page.
Report your issue to https://www.reddit.com/r/uBlockOrigin/, the review section here is not the way to have issues resolved. From your description, this could be caused by either corrupted storage, or even another broken extension is preventing uBO from working properly. I suggest you disable all other extensions and restart Firefox, and if this does not work, un-install and re-install uBO.
