It is not compatible with multiprocess e10s feature of Fireofx 54+ so please make it compatible.
Thanks, it's done now !
Finally not :(
Firefox v54.0.1. Nimbus Screen Cap 9.1.1.
I'm having the same problem. It does not pass the Mozilla Addon Compatibility Report (https://addons.mozilla.org/en-US/firefox/addon/add-on-compatibility-reporter/) and it makes Firefox really slow. Turning off all addons made a huge speedup in FF.
Nimbus is one of my top, favorite addons.
Customer support service by UserEcho