For those who use Firefox, there was an update other day that knocked lots of stuff out (Containers, AdBlockers and other add-ons)
There's now a fix out:
https://blog.mozilla.org/addons/2019/05/04/update-regarding-add-ons-in-firefox/
Really easy, took about 5 minutes to return to normal service (ad free and all add-ons back to working)