Something weird started happening recently, the extension just hangs and I'm unable to open websites. Debug info of the addon repeats this line

Uncaught (in promise) Error: Could not establish connection. Receiving end does not exist.
send moz-extension://0bdccd93-3bcd-40de-8763-8dcb82ab7603/nscl/common/Messages.js:66

The only way to fix this is to restart firefox. Disabling and enabling extension doesn't work (I could disable noscript and websites would start working, but then I'd have lots of scrips left unblocked).