EDIT (5/30/19) -- Thanks to quick response from dev, the issue reported previously (below) is fixed (in v1.9.2). Updating rating back to 5 stars.

Latest version (1.9.1) breaks unrelated apps--can't load a Kibana front end of ELK stack ...

"Error: [ng:btstrpd] App Already Bootstrapped with this Element 'document' http://errors.angularjs.org/1.4.7/ng/btstrpd?p0=document"

...Seems the new version does something it should NOT...

*** GitHub issue opened regarding this problem. ***

...still testing....

Great add-on, thanks! Bug: it deavtivates Facebook-Buttons of "Shariff", so that it does not work anymore - but it is useless to deaktivate it!

Best one! Thank you Mozilla team for FREE internet building!

It is a very helpful add-on, but it blocks the websites' integrated comments widget, which, while planned for, I find a bit annoying.

Allowing the user to temporally put websites into the Facebook container for that may solve the issue.