"Containers are disabled" error on Firefox 52 ESR
For a series of reasons, I had to fallback to Firefox 52 ESR (there are a number of legacy add-ons that are essential for my work and study, so Firefox Quantum is useless to me, right now and in the near future, and Firefox 56, which I was using, is not being updated any more, while 52 is, weirdly). I just found out that your add-on is not working on Firefox 52 (up to the latest 52.7.3). It shows the error message "Containers are disabled :/", although I'm using them...! Attacked image showing the contained tabs (red upper border) and the error message. switch-containers